The outer ring of the lens is usually marked with focal length, aperture, filter size and other information. The information on the sign takes Nikon as an example:

AF-S refers to the autofocus lens with SWM silent wave motor;

VR refers to Nikon’s anti-shake function logo Zoom lens means;

ED means that the lens uses low dispersion lens Nikkor is Nikon’s exclusive trademark for lenses;

70-300mm indicates the zoom range, ranging from 70mm to 300mm focal length;< /p>

Arbitrarily adjustable f/4.5-5.6 corresponding to the maximum aperture value of 70mm end and 300mm end respectively. G is the lens type, which means there is no manual; the aperture ring IF means internal focusing, that is, the focusing process has no length limit on the lens. Change, please note that it is focus, not zoom.