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- Magnification: 20-45x when attached to a Fieldscope III or EDIII; 25-56x when attached to a Fieldscope ED82; and 13-30x when attached to a Fieldscope ED50.
- Angular field of view (Real/degree): 2 at 20x magnification when attached to a Fieldscope III or EDIII; and 1.6 at 25x magnification when attached to Fieldscope ED82; and 3 at 13x magnification when attached to Fieldscope ED50.
- Angular field of view (Apparent/degree): 38.5 for all models. At 20x magnification when attached to a Fieldscope III or EDIII; at 25x magnification when attached to a Fieldscope ED82; and at 13x magnification when attached to a Fieldscope ED50.
- Field of view at 1,000m: Approximately 35 m when attached to a Fieldscope III or EDIII at 20x magnification; 28 m when attached to a Fieldscope ED82 at 25x magnification; and 52 m when attached to a Fieldscope ED50 at 13x magnification.
- Exit pupil: 3 mm at 20x magnification when attached to a Fieldscope III or EDIII; 3.3 mm at 25x magnification when attached to a Fieldscope ED82; and 3.8 mm at 13x magnification when attached to a Fieldscope ED50.
- Relative brightness: 9 at 20x magnification when attached to a Fieldscope III or EDIII; 10.9 at 25x magnification when attached to a Fieldscope ED82; and 14.4 at 13x magnification when attached to a Fieldscope ED50.
- Eye relief: 12.9 mm for all models at: 20x magnification when attached to a Fieldscope III or EDIII; 25x magnification when attached to a Fieldscope ED82; and 13x magnification when attached to a Fieldscope ED50.
Dedicated eyepiece with variable magnification. Allows digiscoping with certain Nikon COOLPIX cameras and the Fieldscope III, EDIII, ED82 and ED50. Features an advanced multilayer lens coating for superior light transmission and clear, high resolution images.
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