What does the letter mark on the lens of SLR camera mean?

The lens outer ring is usually marked with information such as focal length, aperture and filter size. Take Nikon as an example to understand the information on the sign:

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

VR refers to the zoom lens that Nikon's anti-shake function marks zoom;

ED means that the lens uses a low dispersion lens, and Nikkor is a special trademark of Nikon lens;

70-300mm indicates the zoom range, and the focal length is moved from 70mm to 300mm;

Any adjustable f/4.5-5.6 corresponds to the maximum aperture value G of 70mm end and 300mm end respectively as the lens type, indicating no manual operation; The aperture ring IF indicates internal focusing, that is, the lens length does not change when focusing. Pay attention to focus and don't zoom.