Average Reviews:
(More customer reviews)The binoculars them self are great, very clear, good in low light , nice size. Do not care for the lense covers and would have liked a hard case but over all a great product.
Click Here to see more reviews about: Leupold Cascades 10X42Mm Binocular Black 53532
One of the greatest values in current binoculars, the Leupold Cascades 10 x 42mm binocular offers serious optical performance in a slim, in-line design that's easy to grip in all weather conditions and a pleasure to take into the field. An outstanding low-light performer, the Cascades binocular's multi-coated lens system ensures maximum brightness for clarity, contrast, and color fidelity. It also features generous eye relief and twist-up eyecups for comfortable extended viewing, even with eyeglasses, and close focus distance of 10 feet. This rugged, waterproof binocular is covered by the Leupold's limited lifetime warranty.
Specifications:
Magnification: 10x
Linear field of view: 267 feet per 1000 yards/89 meters per 1000 meters
Angular field of view: 5.1 degrees
Objective aperture: 42mm
Twilight factor: 20.5
Exit pupil: 4mm
Eye relief: 16mm
Interpupillary distance: 58 to 72 mm
Close focus distance: 9.9 feet/3 meters
Weight: 23.1 ounces
Length: 5.5 inches
What is Twilight Factor? 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. During daylight hours, when your eye pupil size will be only about 2 to 3mm, magnification will be the principal factor in image resolution. At night, with the eye pupil dilated to 6 to 8mm, aperture size is the controlling factor. In twilight conditions both of these factors control resolution effectiveness and the twilight factor is the term that compares binocular performance under these conditions.
The twilight factor is calculated by taking the square root of the product of the magnification and the aperture. The higher the twilight factor, the better the resolution of the binocular when observing under dim light conditions. 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. Remember, however, that the twilight factor does not take into account the transmittance or quality of the optical system.
Click here for more information about Leupold Cascades 10X42Mm Binocular Black 53532
0 comments:
Post a Comment