AIdentifying CPU and Type G and D Lenses

CPU lenses can be identified by the presence of CPU contacts, type G and D lenses by a letter on the lens barrel. Type G lenses are not equipped with a lens aperture ring.

CPU contacts

Aperture ring

CPU lens

Type G lens

Type D lens

ALens f-number

The f-number given in lens names is the maximum aperture of the lens.

n

158