| This is a medium power wide field eyepiece for general observing under average lighting conditions with current Nikon 50mm, 60mm, and 82mm Nikon Fieldscopes (as well as older 78mm Fieldscopes). The field is over 50% wider than the Nikon zooms at the same magnifications, making this an excellent eyepiece for scanning large flocks of birds at a distance. The optics are fully multicoated, using Nikon’s proprietary antireflection coatings, for high light transmission and contrast.
The eyepiece threads into place. To prevent accidental loss in the field, a rubber O-ring at the base of the eyepiece threads compresses as the eyepiece is screwed into the scope body. This locks the eyepiece in place to keep it from vibrating loose during transport. The O-ring also seals the scope against the entrance of dust and moisture. A twist-up rubber eyecup is standard. Twisting the eyecup counterclockwise extends it and locks it in place for non-eyeglass use. Twisting clockwise retracts the eyecup for eyeglass use. A heavy slip-on rubber eyepiece cover protects the eyepiece optics. A separate slip-on plastic cover protects the scope side of the eyepiece optics when the eyepiece is not mounted on your scope.
With a 50mm Fieldscope the eyepiece provides 20x magnification, with an exit pupil of 2.5mm, and a huge field of view of 189’ at 1000 yards, a full 3.6°!
With a 60mm Fieldscope the eyepiece provides 30x magnification, with an exit pupil of 2mm, and a still very wide field of view of 126’ at 1000 yards.
With an 82mm Fieldscope the magnification increases to 38x and the exit pupil to 2.16mm, while the field of view decreases to 100’ at 1000 yards. The performance is the same with older 78mm Fieldscopes as it is with the newer 82mm versions, except that the exit pupil is a somewhat smaller 2.05mm.
The eye relief is specified at 17.9mm with all scopes, long enough for generally unvignetted eyeglass use. While this is technically correct, the actual usable eye relief will typically measure somewhat less due to the recessing of the eyepiece lens to protect it from being scratched accidentally when the eyecup is in the down position for eyeglass use. A somewhat shorter eye relief than specified is typical of all spotting scope eyepieces.
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