Objective diameter: 60 mm
Magnification: 20 x
Exit pupil: 3.0 mm
Eye relief (acc. to spec): 21 mm
IPD: 56 – 73 mm
RFOV: 2.2 degrees = 38 m
Focus type: CF
Prism system: Porro I
Waterproof: yes
Weight (measured, with eyepiece cover and strap): 1‘418 g
Made in: China


The largest Pentax has been on the market for some time now, and several slightly modified versions have been recorded over the years. What stayed the same is the field of view (FOV), which is quite narrow, compared to other 20x binoculars. People have been criticizing this forever, but the Pentax still finds buyers who enjoy this well made, robust binocular for its reliable mechanics, good optics and easy handling, which all come at a very competitive price. The design with an internal eyepiece bridge makes this bino submersible, which is unusual for Porro binoculars. On-axis sharpness is at par with the Nikon Monarch 5 20×56, which costs twice as much (but has a much wider FOV), off-axis sharpness is acceptable, so the Pentax is well usable under the night sky (again, the narrow FOV makes some astronomers shy away from it); chromatic aberration is unfortunately ery prominent. During the last few years, 20×70 and 20×80 binoculars in various price categories have become more popular, but they are not as compact and perhaps also not as rugged as the 20×60 Pentax, which therefore may continue to find purchasers.


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