Traditional Culture Encyclopedia - Photography and portraiture - What do the numbers on the lens of a digital camera mean?

What do the numbers on the lens of a digital camera mean?

1:2.8-5.6 refers to the maximum aperture range, that is, the maximum aperture f at the wide-angle end is 2.8; At the telephoto end, the maximum aperture f is 5.6.

4.6- 16.8 refers to the focal length of the lens, which is roughly equivalent to 28- 102MM of 135 full-frame camera.

ASPH refers to the use of aspherical lenses in lens groups.