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The Monarch ATB 42mm with Dielectric High-Reflective Multilayer Prism Coating binocular features brighter, sharper colors, crisp and drastically improved low-light performance.
Real field of view is the angle of the visible field, seen without moving the binoculars, measured from the central point of the objective lens. Apparent field of view is the angle of the magnified field when you look through binoculars. The larger the apparent field of view is, the wider the field of view you can see even at high magnifications. With the conventional method used previously, the apparent field of view was calculated by multiplying the real field of view by the binocular magnification. Prisms are what let you see a correctly oriented image when you look through a pair of binoculars. Roof prisms are essentially in line inside the optical tubes, and make for a more compact set of binoculars. Porro prism binoculars can be identified by their offset tubes; the objective lens is not in line with the ocular lens. Using vacuum-vaporization technology, metallic material such as aluminum or silver is applied to the reverse side of a prism surface that is not totally reflective.
Binoculars' brightness is determined not only by the reflective mirror, but also by the total optical system such as the number of lenses and quality of coatings.
The factor that has the greatest impact on resolution or image detail, will be dependent upon the amount of light available during the time of observation.
The twilight factor is calculated by taking the square root of the product of the magnification and the aperture.


A new body style provides unparalleled strength and ruggedness in a package that is comfortable to carry all day.
If your Nikon binocular, Spotting Scope or Fieldscope requires service or repair not covered by our 25 Year Limited Warranty, Nikon will repair or replace it (even it was your fault) for just $10, plus return shipping and handling. The front lenses are usually closer together than the rear lenses, but the reverse can also be true, particularly in compact models. A roof prism system has one surface that does not feature total internal reflection, so vapor deposition with metals, etc. By utilizing light interference, this coating assures high reflectivity across the full visible range, and ensures high color reproducibility. This phenomenon is caused by phase differences arising from total light reflection on a roof (Dach) surface and it can occur with even a perfectly processed prism. During daylight hours, when your eye pupil size will be only about 2 to 3mm, magnification will be the principal factor in image resolution.
The higher the twilight factor, the better the resolution of the binocular when observing under dim light conditions.
The group still retains the high-refraction prisms with their wide viewing fields, and every model has a tripod adapter threading for easy extended glassing from a stationary position. For example, binoculars with a wider field of view are advantageous for locating fast-moving wild birds within the viewfield.
They usually have two pivot points between the tubes, and are more difficult to adjust to the spacing of your eyes. The Porro prism design is usually optically superior to the roof prism design, especially in medium priced class binoculars. Phase-correction coating is applied to the surface to minimize loss of resolution, ensuring high-contrast images.


For example, a 10 X 40 (twilight factor 20) would effectively resolve better under these conditions than a 7 X 35 (twilight factor 15.4) even though the 10 X 40 has a smaller exit pupil. The 10x50 model, with its broad 5mm exit pupil, is ideally suited to high powered lowlight observations.
The new Monarch ATB 42mm with Dielectric High-Reflective Multilayer Prism Coating binocular is available in 8x42, 10x42 and 12x42.
This also applies for finding small nebulas or a cluster of stars in astronomical observations.
This means that if the magnification is the same, the larger the effective diameter of the objective lens, the brighter the image will be. Superior optical design and highquality coating greatly contribute to the brightness of binoculars. Roof prisms can give an optical image equal to the best Porro prisms, but for technical reasons they usually do not. Porro prism binoculars have a single pivot between the two halves of the binocular, and are therefore easy to adjust for the distance between your eyes. In twilight conditions both of these factors control resolution effectiveness and the twilight factor is the term that compares binocular performance under these conditions. Remember, however, that the twilight factor does not take into account the transmittance or quality of the optical system.



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