a 50x optical zoom lens sounds like an impressive measurement, it is not necessarily better equipped to shoot at telephoto range as that of a 42x optical zoom lens. If a 50x optical zoom lens has a wide-angle setting of 20mm, then its maximum telephoto setting would be 1000mm (20 multiplied by 50). If a 42x optical zoom lens has a wide-angle setting of 25mm, then its maximum telephoto setting would be 1050mm (25 multiplied