A pair of 20x50 binoculars seems to be a high-magnification piece of binoculars with an objective lens diameter of 50mm. You may have one pair or you think about buying one. But the question is, what...
A pair of 20x50 binoculars seems to be a high-magnification piece of binoculars with an objective lens diameter of 50mm. You may have one pair or you think about buying one. But the question is, what...