If you enter 60 x 90 it is understood that the magnification is 60 and the diameter of the lens is 90 mm. or by reading the description it says "60mm lens." One wonders what is the number 90. If that were the magnification that ranged from 60 to 90 would be the twin gold-zoom this detail is not shown and also the close-up image indicates not the existence of a small lever that would vary the magnification ...