First, Canon lens structure
Focus ring: adjust the focus position.
Focus switch: automatic/manual focus switch.
Ranging window: display the focus distance.
Zoom ring: adjust the focal length.
Bayonet logo: change the corresponding position of the lens.
EF: Quan Huafu lens, half lens.
EF-S, micro single lens.
EF-M, axis shift lens: ts-e.
24- 105mm: focal length.
1: 4L: aperture.
That is: anti-shake.
USM: Ultrasonic motor.
Second, Sony lens structure
Focus ring: adjust the focus position.
Focus lock: press and hold to lock the current focus.
Zoom ring: adjust the focal length.
Focus switch: automatic/manual focus switch.
Bayonet logo: change the corresponding position of the lens.
FE: Quan Huafu lens, half lens: E.
24-70 mm: focal length.
F2,8: Aperture.
GM: The main lens represents the professional level.
3. Nikon lens structure
Focus ring: adjust the focus position.
Zoom ring: adjust the focal length.
Ranging window: display the focus distance.
Bayonet logo: change the corresponding position of the lens.
Ultrasonic motor and AF-P motor.
24-70mm: focal length.
F/2, 8E: Aperture E type.
ED: ultra-low dispersion lens.
VR: Anti-shake.