Fujinon Binoculars

Fujinon is Fujifilm's optics name, and both of its models here are water binoculars, although they solve the problem in opposite ways. The Polaris 7x50 FMTR-SX at $850 is the classic answer: a porro-prism 7x50 with a field-flattener lens, 23mm of eye relief and military-spec, nitrogen-filled sealing. Owners rate it as the reference marine binocular, with a measured brightness they say outruns modern premium 8x42s, a 7.1mm exit pupil that suits night watches and astronomy, and sharpness close to the edge. The trade-offs they name are a weight of more than three pounds and eyepieces that are focused one at a time, which is ideal on deck and wrong for birds at changing distances. The Polaris range also includes a compass version of the same 7x50 and a 10x50.

The Techno-Stabi TS-X 14x40 at $1,500 answers with electronics instead. Its stabilizer corrects up to ±6°, the widest in Fujifilm's range, enough to soak up a boat's roll as well as hand tremor. Owners describe resolving distant detail that no unstabilized 14x shows. They also report a dim image in poor light, from low measured light transmission and a 2.86mm exit pupil, a weight of 47 oz, and eye relief closer to 7mm in use than the stated 13mm, which rules it out for most people who wear glasses. Fujifilm's stabilized range also includes the 16x and 20x TS-L models and two smaller 28mm models.