My first pair of binoculars so I don't know all there is to know but they are exactly as advertised. Very sturdy, tack sharp, and so far so good. The only thing I can say that could be negative is that I have to fully extend the eye cups and collapse the binoculars as far as they'll go for me to get the view of one clear image without side black creeping in. Maybe my eyes are closer together than most but they're maxed out as for as folding them goes.