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14.02.2015
Best Buy Black Friday 2014 deals are just around the corner with some early holiday preview deals already offering $50 off the iPad Air 2 and MacBook Air savings. Starting on Thanksgiving and continuing through Black Friday, Best Buy will offer a wide range of Black Friday deals from iPhones, iPads and gaming systems to HDTVs, accessories and appliances. We’ll focus on the Best Buy Black Friday 2014 deals you can expect in gadgets and electronics, but also touch on where you can look for more information about the other items Best Buy sells. There are sill no specific Best Buy Black Friday 2014 deals listed, and we don’t expect a leaked Best Buy Black Friday 2014 ad for several weeks, but it is possible to predict what types of Black Friday 2014 deals you can expect. The Best Buy Black Friday hours starting on Thanksgiving are not much of a surprise, considering the continued trend toward Black Friday shopping events that consumer all of November, including Thanksgiving. If you spend a lot of money at the store you can count on early Best Buy Black Friday 2014 access online. The Best Buy Black Friday 2014 doorbusters are the main reason users camp out overnight at Best Buy and the company is already teasing a wide array of options. This took place online and in stores the Wednesday before Black Friday, so you could get the deal without wasting Thanksgiving or waiting in line for Black Friday. Look for some form of last-minute price-matching to take place again as Best Buy continues to take on Walmart and other retailers. These are not specific Best Buy Black Friday 2014 HDTV deals, but you can count on Best Buy to offer similar savings across multiple sizes of HDTVs. It’s tough to tell exactly what Best Buy will do with the changes to the iPhone and iPad lineup this year. In addition to the $50 off Xbox One deal that starts on November 2nd at multiple retailers you can expect to see some type of PS4 Black Friday deal at Best Buy, possibly up to $60 off or a bundle with games. Look for $10 to $15 off recently released games like Call of Duty: Advanced Warfare and 30-50% off gaming headsets and possible controllers for the Xbox One and PS4. Most game deals are not worth standing in line for, but if you order online the savings are certainly worth your time. Look for Best Buy Black Friday 2014 deals on laptops that range from below $200 for a budget notebook up to $1,000 for a MacBook Air or MacBook Pro Retina.
The biggest thing to look for this year are deals on mainstream laptops and ultraportables that Dealnews predicts will hit new records this year with ultraportables at $450.
It will be interesting to see what role cheap Windows 8 notebooks like the $199 HP Stream play through Black Friday 2014.
KOLKATA: Gold demand in the country is expected to rise up to 10% this wedding season, which kicks off this week and continues till early June compared to a year-ago period, helped by a significant fall in its prices, trade insiders say. Prices of the yellow metal fell by Rs 1,000 per 10 gm in the past one week to around Rs 26,400 on March 9. Jewellers started restocking for the wedding season after a fall in imports in February as the trade was expecting a drop in import duty from 10% to at least 4% in the Union Budget.
Though figures are yet to be announced, trade estimates gold imports of 40 tonne in February, down from around 60 tonne in January. On Monday, though, gold edged up in global markets, but it remained near a three-month low as the US dollar hit an 11-year high after strong US jobs report boosted expectations that the Federal Reserve would soon increase interest rates. Somasundaram PR, MD (India) at World Gold Council, said the fundamental driver of gold demand in India is the cultural affinity towards gold coupled with a rich native wisdom about the economics of gold in a household portfolio. Social changes and new asset classes have fundamentally reinforced the role of gold as an essential diversifier and as a long-term hedge against inflation. YouGov, one of the leading market research firms in the UK, has recently published a study called Smartphone Mobile Internet Experience, which shows that customer’s trust in the Nokia brand continues to decline. When asked what smartphone they would consider buying next, 56% of the respondents said: Apple iPhone.
What’s even worse for Nokia: only 10% of the study participants expect to actually buy a new Nokia smartphone (compared to 19% in December 2009), while 41% expect to buy an iPhone. You see, Nokia, that’s what you get for sticking with the old Symbian UI for so long and for launching devices like the N97. Among the reasons why our customers are so successful is that they are better informed and advised before they buy, and well supported afterwards too.
If you own a portable computer then we encourage you to download a free planetarium (night sky guide) software that will help guide you through the sky and to identify what is up in the night sky and when. In fact some of the celestial wonders, most notably meteor showers, are best seen by the naked eye owing to the brief appearance of the objects combined with how they may be dispersed across large areas of the sky. You should consider starting off in the hobby with a binocular, especially if you already own one. And with most hand held binoculars forget about doing much more than identifying a few planets by their color, or seeing an elongated disc that you may recognize is Saturn.
Of course, we do sell wonderful larger binoculars that can show more impressive views of the Moon and other deep sky objects. Right: one of our the most acclaimed mid size binoculars for astronomy is the Fujinon 16x 70 mm FMT-SX (98,506 bytes). Our point here is that it has been our experience that more newcomers will progress further and for longer into the hobby if they are to buy either tool, with a telescope. Today there has never before been such a wide selection of telescopes on the market, neither have there been so many that are suitable for the novice and that sell for a comparatively modest cost. Special Considerations When Buying For Children: a telescope can be a great gift for a young child when that child has demonstrated some sustained interest in astronomy or related subjects. This article will help you to understand how telescopes work, and how to best pursue the decision making process when buying an amateur telescope. While it is geared more towards the hobby of astronomy, many of the basic principles apply to birding or nature watching telescopes too. It has never been a better time to enter the hobby of astronomy since so many good telescopes are made today, many that simply did not exist decades ago, but that are comparatively affordable. There is no such thing as a beginner's telescope anymore than there are beginner's hammers. Which would you rather see through your telescope - the Saturn at left, or Saturn looking like a BB in the Washer at right? The worst aspect of failure is when a poor choice of telescope destroys any budding interest there may have otherwise been in the hobby of astronomy. We suggest you save your money (skip a few nights out to dinner, etc.) to buy something better, a telescope that will give you better reasons to go out out night after night. God Did Not Make All Telescopes Equal: Telescopes do vary in design, aperture, physical dimension (length, width, and weight).
A telescope can be thought of as a "Light Funnel" in that the telescope gathers light that enters through a relatively large opening (the Aperture) at the front of the telescope.
Right: Astro-Physics 92mmf7 "Stowaway" Apochromat Telescope with retracting Lens Shade extended, Lens Cover removed.
The Fork Mount is a very easy to understand and by being the most intuitive type of telescope mount to use they have become ubiquitous. The Fork Mount usually includes a clock drive installed within the Base to drive the Right Ascension axis. Let's use the example of taking an image of the Moon with an Orion SkyQuest™ XT-8 telescope with a Prime Focus Camera Adapter. A year ago the Best Buy Black Friday deals delivered deep discounts on Apple products, HDTVs and many other savings online and in stores with long, long lines. If you are visiting a Best Buy on Black Friday 2014, expect long lines even before you eat Thanksgiving dinner. Lines formed on November 20th last year for Black Friday.
Last year Best Buy started online sales of doorbusters on November 25th for My Best Buy members at Elite or Elite Plus status. The retailer matched an excellent iPad mini deal that included a $100 gift card effectively dropping the price to $199.
Dealnews predicts a 60-inch off brand HDTV for $420 and name b rands at $725 this Black Friday overall, and Consumer Reports also chimes in with expectations for big deals on 60-inch or larger HDTVs.
Last year the retailer offers 55-inch and 65-inch name brand HDTVs for $499 and $999, plus many other deals on a variety of brands with prices from $79 to $1,999 for name big 3D smart TVs. Bachhraj Bamalwa, director at All India Gem & Jewellery Trade Federation, said the industry expects gold demand in the jewellery segment to rise 5-10% over last year. Jewellers feel Indian consumers have become resilient to high import duty regime and are no longer waiting for a cut in duties. The trade now expects this pent-up demand to be unleashed as consumers no longer expect a reduction in the import duty soon. Gold jewellery demand in the country rose 8% last year to 662 tonne from 612.7 tonne in 2013.
Now, MeeGo seems to be capable of fighting with iPhone OS and Android, so make sure you don’t screw up. In an effort to help you we have written this overview to help you avoid mistakes and buy more wisely. In fact it is a simple matter to begin exploring the night sky tonight - just step outside and look up with your naked eyes. The software Stellarium is among the best and easiest to use astronomy software efforts, with versions made for either Windows PC, Apple Macintosh OSX, Apple iPhone, Linux, and other platforms.
This perspective shows the night sky from a backyard point of view; there are many other choices of how and from what point of view the application will project. Company Seven has helped to build several astronomy clubs in our region, these and other clubs around the world offer a beginner the chance to observe at comparatively favorable locations in safety, and look through various telescopes and binoculars to help you judge which might be better suited for you. If you already own a binocular of reasonable quality then you certainly will find it better for seeing a number of celestial objects than by the naked eye alone. For one, you may spend as much or more money to buy a good binocular than you might spend on a more versatile first telescope. But with a telescope one can attain clear distinct views of the Moon and its terminator, changing major features of the planets, and most telescopes we will recommend you start off with will have the added light gathering power to see fainter objects more distinctly.
But these larger binoculars are unwieldy for hand held use over extended sessions, and so they are often mated to a parallelogram mount with tripod.
The binocular is shown here supported by an optional Universal Astronomics UniMount™ Light Deluxe parallelogram mount and field tripod. But consider that very young children (ages 4 to 6 or so) go through phases that can pass in a matter of weeks, days, or hours and you should so balance the desire and expense carefully. And to learn more about what can be seen in the night sky, and how to observe you may refer to many on line sources including our own observing planning aids page, or you can perform a search by entering your state and "astronomy club" in an Internet search engine. Unfortunately, a high percentage of telescopes sold today are not very good for astronomy; they are put together in great numbers and then marketed by people who understand little about telescopes or the hobby. Our first contact with most newcomers who call or visit our showroom often starts out with them introducing themselves with something like "I want to buy a beginner telescope" or "I want to buy a telescope for $XXX, what do you have?" While most of us who work for Company Seven probably started into the hobby years ago asking similar questions, we now relate that approach akin to greeting the staff in a hardware store with "Hi, I want to buy a tool today, and I have $50 to spend - what do you recommend?" There is no such thing as a beginner's telescope anymore than there is a beginner's hammer or a beginner's screwdriver; there are cheap tools and then there are tools that work well and last longer than others. The "Test Telescope" We understand why many people reason "I just want to buy a first, inexpensive telescope to see if we are interested in the hobby". But just for argument's sake, lets assume that first telescope inspires someone to want to see more.
And while you are saving your funds there are ways to explore the hobby and determine whether or not the interest may take hold. And they differ how well they are made, even from one another of the same model they can vary.
Then the telescope optical components (reflecting mirrors, refractive lenses, or a combination of both types of optics) will then gradually bend that light condensing it to form one virtual image at a point (Focal Plane).
This period of 23 hours 56 minutes 04.09053 seconds is called the sidereal period, or the period relative to position of the stars overhead.


Fork Mounts can be the quickest Equatorial platform to set up since as few as two components (telescope in the Fork, and a Field Tripod with or without Wedge) may be all that comprise the basic telescope. Earlier mounts made through the 1980s incorporate manual over ride fine geared controls for Declination and Right Ascension. But the most popular are the versatile and relatively compact Schmidt Cassegrain telescopes (SCT) pioneered by Celestron in 1970, but since 1980 also made by Meade Instruments. The German Equatorial Mount is selected for use with telescopes of relatively longer physical lengths, or for improved portability with some mid sized and larger telescopes, or to increase versatility.
Also, there is no need to change piers as the centrally located pier of a German Mount makes upgrades easier than that of the Fork Mount. The telescope will swing from one side of the mount to another ('meridian flip") as once proceeds to explore the four quadrants of the hemisphere.
Besides that consider the challenges faced when trying to photograph a planet at much higher magnifications and higher focal ratios. The free My Best Buy rewards program offers Elite status at $1,500 in spending in a calendar year and Elite Plus at $3,500 in a calendar year.
Consumer Reports also expects to see deals on newer Ultra HD TV sets commonly called 4K TVs. Ours is a public service oriented company, we bring decades of experience working with amateur and professional astronomers to bear when helping others to prosper in our hobby.
We hope you will read this carefully, making notes as your proceed, then refer to other applicable sections in our Internet site.
You will do a bit better to get started by using aids as simple as the Planisphere or a basic Start Chart with either illuminated by a red flashlight to conserve your night vision.
This is a beautifully done and highly capable free open source planetarium for your computer. A good binocular can help one to learn their way around the constellations, see some of the brighter large objects including the Andromeda Galaxy, large emission nebulae including M42 the 'Great Nebula' in Orion, and the occasional comet.
Our point is that if you are going to drag a tripod outdoors, then why not take a telescope if you can manage to transport it to where you plan to observe? The first telescope should be a tool that will impress the viewer providing memorable views of those magnificent celestial objects including the planets and the Moon. Be mindful that when buying a telescope for a youngster the chances of real success will be improved if someone can provide the child with basic instruction about how to use the telescope, and with some initial guidance on how to find one's way around the night sky. These retailers think foremost of putting something in their store shelves that will attract impulse buyers and they are largely successful in making sales and recouping a high percentage profit.
That approach reveals nothing about what the user might hope to accomplish with their new telescope, and it may arbitrarily limit what you are offered by most salesmen elsewhere.
That approach might work with many other purchases, but for buying telescopes that rationale is rarely successful because the telescopes sold at the lower prices are quite limited in what they can show, and so the novelty of most modestly priced telescopes usually wears off soon as the user will almost always quickly tire of going out only to observe an object with no detail, or changing features. If one does remain at all interested in the hobby then that modest first telescope is likely to be outgrown soon, and that customer will be back soon for a better telescope - and the $100 or more invested in the first telescope will likewise have been wasted.
After all there should be no rush to buy a telescope since the sky is not changing all that fast. And while two telescopes may appear to be identical in their advertising claims and by their appearance, one telescope may provide a great experience while the other becomes a source of frustration. The Focal Plane of a visual telescope is located at a point just beyond the Focuser of the telescope. The sidereal period is not exactly equal to one 24 hour day because by the time the Earth has rotated once on its axis, it has also moved along the path of its orbit around the Sun, because of this the Earth has to keep rotating for about another 4 minutes before the Sun seems to be back in the same place in the sky that it was in exactly a day before.
There are fewer parts to carry than the German Mount typically requires, and far less counterweights; typically only a comparatively lightweight set attached to the optical tube to balance it in Declination. More recent computer controlled telescopes may include no manual controls relying instead on the electronics to operate all functions of the mount.
The most popular consumer models (that make sense in astronomy) are the 8" (20cm), but consumer grade Fork Mount SCT's are made as large as the Meade 16 inch observatory telescope.
The German Equatorial Mount is the design preferred for the physically longer telescopes including the Newtonian Reflector and Refracting telescopes. At times this flip may be inconvenient, and has to be planned for when attempting long-term tracking (astrophotography, etc.).
Remember, it is the telescope optical tube assembly determines what may be seen and what may be photographed.
The Moon is about the only celestial object where most people will be impressed with the image, it could be accomplished economically with this telescope and a Camera since the Moon is very bright. Bamalwa of All India Gem & Jewellery Trade Federation said the investment demand will remain less as internationally gold prices have fallen. After this homework assignment you will be better able to participate with us in helping you attain a good outcome. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope.
If you have no space to store a telescope, or if you travel frequently then a binocular might be more practical for those adventures than taking a telescope. Besides that, almost any well made larger binocular with a stand will cost as much or more than a reasonably well made first telescope - and the binocular will not best the telescope for versatility. The better telescopes can give you access to worlds beyond our solar system where there await galaxies, star clusters, double stars, nebulae and more! However, many of the 'department store' telescopes that are sold end up in a closet or in the trash. The approach that is much more likely to produce a good result requires one to start thinking of telescopes as a tool, with each model having specific strengths and weakness.
Just imagine going out night after night only to see Saturn appear as a BB within a washer; how many nights will you want to go out only to see the same thing?
And since the accessories provided with the common department store telescope are usually not upwardly compatible (if at all desirable) for use with a better quality telescope, there will be nothing to salvage from the first telescope to help growth into another more advanced model. Unlike other commodities such as cars where there are standards (every car has headlights, tail lights, can do 55 mph, etc.) or in foods where guidelines define what claims may be made, there is no regulatory authority governing the advertising of telescopes. This arrangement allows movement of the telescope optical tube assembly up and down, and left and right.
The downside is that the fork is typically not made to release the optical tube and so one must carry the entire assembly. The Fork Mount is a good choice for those who need quick response to reach any quadrant of the sky for activities such as gamma ray burst or satellite tracking studies, etc. When using a German Mount with a Newtonian telescope this may put the eyepiece at an uncomfortable position however, most Newtonians we offer have available Mounting Rings that can either rotate the tube or that can be loosened to rotate the optical tube to position the Focuser and Eyepiece at more convenient positions.
But it is the mount (or carriage) of a telescope that determines how the telescope can be employed. But as the Earth rotates, the objects in space appear to move across the field of view of the telescope eyepiece or camera.
So we are not saying that in time one can not pursue this work with an XT-8, but it will need to be moved onto a suitable tracking German Equatorial Mount to be successful in astrophotography such as shown at right. Our customer satisfaction rate is uncommonly high in this industry, we measure that by our incredibly modest return rate; we may go through one or more years without a single customer returning their telescope. The Stellarium application includes a selectable day or night vision (dark red screen) mode, so you could be out tonight holding your iPhone overhead and seeing the sky mapped for you - and it will follow you along as you move the iPhone from one part of the night sky north or south and east or west!
Furthermore, some binoculars may be suitable for other applications too including: birding, travel, shows or sports, spying on your neighbors, etc.
The frustrations shared by many beginners in the hobby who buy these tend to originate with: a.
Beyond that also understand there is no one telescope that can do it all for you in either astronomy or for nature watching, even the Hubble Space Telescope has it's strengths and weaknesses.
This motion can be observed with the naked eye if one carefully observes the limb of the Moon as it rises or sets behind trees or some other fixed object in the distance, the motion though slow is perceptible.
If the fork mount is attached onto a level platform or a field tripod then the telescope can easily be used for terrestrial applications. So the largest of these telescopes that can be managed by the average adult is the Celestron 11" (28cm) or the Meade 12" LX200GPS (30cm) as the weight either of these larger telescopes can exceed 70 lbs.
Your telescope must have a tracking mount such as a German Equatorial Mount to enable the system to take good images of celestial objects; even an image of the the Moon will not be as sharp with a quick snapshot taken at a Dobsonian telescope focuser as it would if the telescope were tracking. As we increase the magnification even to the point of filling the camera frame with the Moon (typically about 100x) then the apparent motion of the Moon moving across the sky will be speeded up by the same magnification factor.
And where we really shine is if a problem or service issue arises, there we tend to be matched only by the response of the few most conscientious manufacturers in our industry. And so just as when picking a tool, when your task requires a $100 table saw then you should buy (or rent) that table saw. For tracking in astronomical uses the Fork Mount is attached onto an Equatorial Wedge with Tilt Plate adjusted (raised or lowered) so that the R.A. Consumer computer controlled telescopes fork or German mounts typically can slew at up to 3 degrees per second, while the fastest slewing mounts in professional astronomy are fork systems capable of moving at up to more than 20 degrees per second! But with a little practice the system is easy to use: the the telescope is slipped into place with counterweights added and balancing done in both axes, with the mount Pole axis Aligned.
Computer Controlled Fork Mounts when introduced in 1985 by Celestron International the "Compustar" telescope became the first consumer oriented computer-driven telescope sold.
If you choose to start of with a binocular then you should have a suitable guide book to help you find and understand what you will see; among the titles we recommend is Touring The Universe Through Binoculars, a softcover book by Philip S. With a very well designed Alt-Azimuth mount it is possible for an observer to track objects by manually guiding the telescope at magnifications of 200X or more, and some people are comfortable at magnifications in excess or 300X. The German Mount has two perpendicular axes called the Right Ascension (RA, or Polar) and Declination (Dec) axes. The consumer oriented computer-driven Fork Mounted telescope has since evolved over the past decades to offer a good degree of simplicity and user friendliness, and Celestron and Meade Instruments have come to dominate the consumer markets for these products. The blur may not be a concern to you in a small print but if you take two images one on a tracking mount and the other without, then blow the images up side by side you will see the differences. While the image from most astronomical telescopes may appear upside down, and or inverted left to right. In an equatorial arrangement the Fork Mount is an aid to teaching concepts in astronomy including the Coordinate System used for Celestial Navigation. When the RA axis is aligned parallel with the Earth's rotational axis, objects can be easily "tracked" as they drift across the sky (due to Earth's rotation) by turning just one axis (RA) instead of two, as is required with an alt azimuth mount. This is not a great concern because astronomers care more about the quality of an image than it's orientation. There are a number of designs of Equatorial mount but those which the amateur is most likely to encounter are the Equatorial Fork and the less intuitive German Equatorial arrangement. You point the telescope onto an object by simply nudging the tube up or down, and left or right by hand. And after all, how many people would even know they were looking at an Jupiter upside down? Computer Controlled Fork Alt Azimuth mounts are coming available too where the mount moves simultaneously in two axes to stay on target.
Once centered onto an object an electronic "Clock Drive" can keep the telescope moving with the object across the sky. The eyepiece is at a convenient position on most Newtonian telescopes, but it is at the rear of the tube of Refracting and Catadioptric telescopes. Either mount head is attached to a suitable field Tripod (usually made of wood or aluminum), or onto a portable or installed Pier usually made of aluminum or steel.
And with the ability to track in Right Ascension comes the electronic capability to make fine adjustments in Declination too, since this is a "dual axis" drive system.


These Fork Mounts dispense with the weight and cost of the Equatorial Wedge, unless one wishes to become involved in time exposure astrophotography. So to provide more comfortable observing through Refracting and Catadioptric telescopes these are usually furnished with a 90 degree angled mirror or prism accessory ("Diagonal" or "Zenith Prism") installed between the focuser of a telescope and an eyepiece. The Diagonal diverts the cone of light coming out of the of the telescope to a more comfortable viewing position, this is especially helpful if you are looking at an object overhead in the sky with these telescopes. This becomes particularly desirable when operating at those higher magnifications necessary to observe some of the brighter deep sky objects, and the more subtle features on the planets. Capability to accept electronic single or dual axis tracking drive.
Most of the consumer consumer oriented computer-driven still require the operate to have at least some knowledge of the night when setting up the telescope.
A good quality Diagonal may account for some barely perceptible light loss, but the convenience provided by it will be well worth it. To track precisely, the rotating Right Ascension Axis of the mount is adjusted up or down and left or right by the user so that this axis of the mount is parallel to the rotational axis of the Earth. When the telescope mount is properly set up, it can move the telescope from one object to another across the sky. The Diagonal accessory is not compatible with most Newtonian telescopes since the Newtonian lacks the back focus distance needed to pass the light through the extra distance taken up by the Diagonal and reach the eyepiece. The image from a Refracting telescope with a Mirror or Prism Diagonal installed will appear right side up, but backwards left to right. Depending on the telescope, an equatorial mount will provide acceptable results for visual uses even if the mount is aligned to only within about a few degrees of the Celestial Pole.
If there are any errors in the system due to even a slight inaccuracy of initial set up, or slop in the optical system or optical tube mounting hardware, then the pointing errors can accumulate reducing the pointing accuracy to a point that the observing session may have to pause as the operate reindexes the mount precisely onto a known star or other reference point in the sky. Also keep in mind the telescope's computer is not a substitute for observing experience. But as you align the Mount more and more accurately then the need to periodically make minor adjustments to center a target in the eyepiece becomes less frequent. The telescope can not tell you when a night is clear and steady enough to see an object in its database clearly.
A very accurate alignment of the mount to the Celestial Pole is necessary for those persons who intend to attempt long exposure astrophotography or CCD imaging. One night you might use a larger "light bucket" for small faint objects, then later slide off the light bucket and slip on another high resolution telescope for even better views of planets, or for astrophotographic coverage of wide fields of view.
And the telescope electronics can not tell you which accessory to use or not on any particular target of the observing session.
For example, a poor quality Diagonal will introduce problems which may appear as a blurring, loss of brightness or subtle details. The controls of some German Equatorial Mounts are provided with long dangling flexible cables to make it possible to control the telescope while at the eyepiece. It is usually quite easy to remove an optical tube from a German Mount, then take down the mount. How To Weigh What Will be Most Important to You There are many factors to consider when starting the process of choosing a telescope. This is why astronomers do not mind seeing an image that is reversed, in fact it is not uncommon to find Sky Atlas or Moon chart printed to match their orientation as observed through a telescope.
The motion is so slow that few people can observe the motion, this rotation is only on the order of one revolution per 24 hours!
For viewing the brighter large objects such as the moon, or for day time use looking at terrestrial objects then an image erecting prism may be employed with very little noticeable degrading of the image. 4.
For convenient observing, or for astrophotography many mounts will accept the option of (or may include) a battery powered drive motor to permit automatic rotation of the telescope. What objects can you realistically expect to see from where you will observe? will you choose a high contrast telescope design that is more likely to show those objects you can see from an urban or suburban environment? are you prepared to take the telescope away from the city to darker skies? The drive is sometimes referred to as a "Clock Drive" since the earliest mechanical telescope drives were clock mechanisms modified to rotate only once every 24 hours.
If so then you will be able to use it to observe the fainter deep-sky objects and so you may be more inclined to buy a larger telescope. b.
With this accessory you could walk away from the telescope and come back later to find the telescope still on the target.
How will the telescope fit into the users lifestyle? how large a telescope will you feel comfortable carrying in and out of your home? For those persons "down under" in the Southern Hemisphere, the motion turns the telescope in the opposite direction and so most of the better motorized telescopes have a switch to permit the operator to select a clockwise or counter clockwise motion. When properly set up the Equatorial Mount (do not panic, the staff at Company Seven will teach you how to do it) These mounts may be equipped with hand driven gear controls with long, dangling flexible cables. If you do want a larger aperture but can not manage the weight of a fork mounted 11 or 12 inch SCT, then maybe you will consider a more modular German Mount arrangement. how large a telescope can you fit in your automobile?
Many mounts will accept the option of (or may include) a battery powered motor drive, in such a case you could walk away from the telescope and come back later to find the telescope still on the target. The type, and quality of the mount and its drive system will determine what if any distractions from observing there may be, and if one will be provided the ability to become involved with astrophotography. During the process of choosing a telescope based on performance the importance of the three variables to the buyer are balanced, one against the other. Observe how the "meeting points" originate at the corners and meet somewhere in between reflect potential compromises. Telescope #2 has a large Grade A aperture, with a Grade C or D in areas of Quality of excellence and Design.
Depending on your priorities Telescope #1 may yet actually be a better choice Telescope #2. The user may determine that telescope #1 is the best choice in terms of performance and portability reasons.
Or, if the cost of telescope #1 is too high, then possibly the buyer may be able to find another telescope with some compromise of Quality or Design to a degree that it becomes a reasonable acquisition. One could extend the number of variables if so desired, possibly factoring in usefulness for astrophotography. A spreadsheet could be written, with a column for each aspect that is considered important, and each with a value assigned - possibly using a 1 to 10 scale.
After values and priorities are assigned, the values could be totaled up; this can help one to reach more objective understanding of the possible choices.
Refracting Telescopes Left: Vixen 102FL 4 Inch f9 Fluorite Apochromatic refractor telescope shown on optional Vixen GP German Equatorial Mount and Tripod.
This is one of the first relatively "affordable" high performance 4 inch apochromats made available to the amateur.
The larger, well made refractors have long been considered the instrument of choice by professional visual astronomers - and many remain the focal point of large public and research observatories. The refractor is characterized by a relatively long and narrow closed tube employing glass lenses to bend (refract) light to form the primary image.
Usually these telescopes incorporate a Lens Shade (Dew Cap) to block off-axis stray light, and reduce formation of dew over observing sessions in damp environments; the Dew Cap may be fixed in place, or thread on (as shown on Vixen 102FL telescope above left), or retracting to minimize length in transport. The focusers often have draw tubes long enough to accommodate a good selection of photographic and visual accessories. The ratio of aperture to focal length of a refractor is typically between 5 to 9, or or as long as 15. Good refractors remain the preferred choice of visual astronomers who seek the most natural, contrasting and clear images of the brighter objects (Moon, planets, stars, Sun etc). What is an "Apo"? Short for "apochromatic", this term describes a design that brings the three primary visible colors (red, green, blue) to focus at or very close to the same plane. Colors of the spectrum have differing wavelengths, to see this consider how in a normal optical glass prism the red and blue rays are bent (refracted) at slightly different angles as they pass through. In camera Normal and Wide-angle lenses this is imperceptible, or it can be corrected with other techniques. But telescopic refracting lenses magnify the variation in focus between red and blue light rays. In a telescope, this dispersion results in color fringing often manifested as a violet halo surrounding objects that contrast one against the other, and an overall reduction of sharpness. One way to reduce the false color is to increase the focal ratio so that light traveling through less glass may suffer less dispersion - hence the relatively long f15 ratios typical of refractors up to the late 1970's.
But even f15 refractors (which can become unwieldy, and require more costly mounts) will show some false color at higher magnifications.
In another approach, camera lens making companies (most notably Carl Zeiss, Nikon, and Canon) pioneered the Extra-Low Dispersion glasses, and Fluorite crystal technologies to solve this problem. These materials provide reduced chromatic aberration in portions of the spectrum from the D (yellow), through C (red), F ( blue) and G (violet) Fraunhofer lines.
The transmitted wavelength from 0.125 to 10 microns may br twice that of common Crown glasses.
And so compared to Achromatic designs, Apos can provide a brighter, more clear image particularly at higher magnifications. Reflecting telescopes (discussed below) reflect light uniformly across the visible spectrum - and so these are by their nature "apochromatic" designs.
The fastest Apos offer low magnification wide field of view capabilities necessary to observe the larger nebulae, or perform wide angle astrophotography, and yet they retain the high magnification clarity to reveal and photograph the changing features of the major planets. The faster refracting telescopes also may provide awesome panoramic views of the countryside or seashore.
However, some people still prefer the f8 to f9 Apos, particularly for observing planets, and possibly saving some money since it is easier and somewhat less costly to make a first rate Apo perform well at f9 or so, than at faster f ratios. Al Nagler's patented four element design is based on the "Petzval" concept where a two element air spaced objective lens at the front of the telescope passes the light through to a second doublet lens positioned at the rear of the telescope and before the focuser.
The doublet lens group at the rear functions to 1) reduce the effective focal length, and 2) reduce or eliminate curvature of field so that images are sharp and clear from the center to the edge of the field of view. Models with apertures of up to 5 inch it is a simple matter to move the telescope with mount outside to a convenient location, and pound per pound these better models provide the best views. Commonly provided with either right angle prism or mirror diagonal, the view is right side up but reversed left to right; this is fine for astronomy and many terrestrial applications. The more compact (faster f ratio) varieties with magnifications that can go to as low as about 10X or less are the most highly recommended telescopes for terrestrial use with some being accessorized with an image erecting prim in order to correct the image left to right as well. A healthy adult can manage about an 18 to 20 inch (or larger) truss telescope since with current technology the bulk and weight of the glass or ceramic mirror remains the limiting concerns.
Never before has the enthusiastic amateur community contributed so much, so rapidly to the evolution of a telescope design. Since each telescope has a focal length of 48 inches then the physical length of the two telescopes are similar. The price difference between common beginner 6 and 8 inch Dobsonian is only about $100 while there is a 50% or more increase in light gathering power favoring the 8 inch over the 6. So we suggest beginners consider the 8 inch f6 at a minimum if they seek a good, economical, telescope and are comfortable with the other characteristics of these telescopes. The best made Dobson telescopes with apertures up to 10 inch include those made with rolled metal tubes offered by Orion. The best larger Dobson telescopes include the truss tube telescopes made by Obsession, Star Master, and by Astro-Systems.
The larger telescopes are a good choice where it is a simple matter to move the telescope outside to a convenient location. These are impractical for terrestrial uses due to the awkward position of the focuser, their reversed and inverted image, and the relatively long distance from target required to focus. These telescopes even as small as 6 or 8 inches in aperture may be too lengthy to fit into some very small cars, and these or larger telescopes may be more bulky than many adults or children wish to manage. Focal ratios of between f5 to f6 provide good versatility, as they grow to f7 and longer these become awkward for many and limit the field of view more and more although at f7 or more their contrast can improve to provide refractor like views of the planets, and moon. We recommend no Newtonian to adults or teens smaller than 6 inches for astronomy unless the Moon and Sun (with safe solar filter) are the only objects of interest.



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