Conclusion: I think we have a surprise here. A bit cheaper Nikon Action EX not only is physically lighter, although as solidly build as the device tested here, but also fares better. The difference is perhaps not huge but still noticeable. What’s interesting, the coatings, implemented here, influenced the performance. It seems that in a more expensive model we should deal with better antireflection coatings.
Pros: good correction of chromatic aberration,, slight astigmatism,, well-corrected coma,, negligible brightness loss on the edge of the field,, decent colour rendering,, good quality of prisms.
Cons: magnification significantly better than declared,, part of air-to-glass surfaces seems not covered,, truncated exit pupils,, a lot of flares in the area near exit pupils,, small, deeply hidden central wheel,, image resolution on the edge of the field should have been better.