Hi, i have owned a pair of tasco OS21 offshore binoculars for the last twenty years, they are 7 x 50 waterproof and i have always though the optics were pretty good,
yesterday i had the chance to try them against a pair of high quality leica 10 x 42 binos and to be honest apart from having less magnification, neither of us could see any real difference.
The tasco were in my humble opinion just as good in low light conditions,
So if you are looking for a good pair of binos at a reasonable price £150. look no further