Specifications:
Objective diameter: 40 mm
Magnification: 8 x
Exit pupil: 5 mm
Eye relief (acc. to spec): 17 mm
Usable eye relief (measured from rim of eyecup): 15 mm
IPD: 56 – 72 mm
RFOV: 8.2 degrees = 143 m
AFOV: 59.7 degrees
Minimum focus distance (measured): 3.8 m
Focus type: CF (direction of rotation from close to infinity: > clockwise)
Range of diopter adjustment (acc. to spec.): +/- 3 dpt*
Excess travel of focus wheel beyond infinity position (estimate): 4 dpt*
Prism system: Porro I
Waterproof: yes
Weight (measured, with eyepiece cover and strap): 915 g
Made in: China
*range of diopter adjustment not affected by position of focus wheel
Remarks:
Like all of Nikon’s Action EX models – porro binoculars currently in the configurations 7×35, 7×50, 8×40, 10×50, 12×50 and 16×50 – this 8×40 offers good value for its price: nice field of view, quite good central sharpness, acceptable edge sharpness, waterproof design. The Action EX models are among the best lower middle class binoculars on the market.
see also separate posts “Nikon Action EX 7×35”, “Nikon Action EX 10×50” and “Nikon Action EX 16×50”
https://binocular.ch/nikon-action-ex-7×35-cf/
https://binocular.ch/nikon-action-ex-10×50/
https://binocular.ch/nikon-action-ex-16×50/
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