Nikon 4×10 DCF



Objective diameter:  10 mm
Magnification:  4 x
Exit pupil: 2.5 mm
Eye relief (acc. to spec): 13.7 mm
Usable eye relief (measured from rim of eyecup): 10.5 mm
IPD: 57  – 72 mm
RFOV:  10.0  degrees = 175 m
AFOV (measured, rounded): 40 degrees
Minimum focus distance (measured): 1.25 m
Focus type:  CF (direction of rotation from close to infinity: > clockwise)
Degrees of rotation of focus wheel from 3 m to infinity (measured): 95 degrees
Range of diopter adjustment: N.A.
Excess travel of focus wheel beyond infinity position (estimate): 4.5 dpt
Prism system:  Schmidt-Pechan (?)
Waterproof: no
Weight (measured, with eyepiece cover and strap): 65 g
Made in: Japan



Miniature binocular for the jacket; there is no diopter adjustment, so this can only be used by people with identical, or almost identical, eyesight left and right. Needs a bit of learning how to best hold it, but then it is actually more useable than you might expect, e.g. at concerts or sports events.


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