Nikon D6, Reference Manual

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1044
Compatible F Mount Lenses
A
Recognizing CPU and Type G, E, and D Lenses
CPU lenses can be identified by the presence of CPU contacts ( q ). Type G
lenses are marked with a “G”, type E lenses with an “E”, and type D lenses
with a “D”. Type G and E lenses are not equipped with a lens aperture ring
(
w ).
CPU lens Type G or E lens Type D lens