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.
Pros: good correction of chromatic aberration,, slight astigmatism,, well-corrected coma,, negligible brightness loss on the edge of the field,, decent colour rendering,, go...
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 pupi...