Nikon D500 User Manual

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A
Recognizing CPU and Type G, E, and D Lenses
CPU lenses (particularly types G, E, and D) are recommended, but note 
that IX-NIKKOR lenses can not be used. CPU lenses can be identified by 
the presence of CPU contacts, type G, E, and D lenses by a letter on the 
lens barrel. Type G and E lenses are not equipped with a lens aperture 
ring.
CPU contacts
Aperture ring
CPU lens
Type G/E lens
Type D lens
A
Lens f-number
The f-number given in lens names is the maximum aperture of the 
lens.
A
Compatible Non-CPU Lenses
Non-CPU lens data (
0 250) can be used to enable many of the 
features available with CPU lenses, including color matrix metering; if 
no data are provided, center-weighted metering will be used in place 
of color matrix metering, while if the maximum aperture is not 
provided, the camera aperture display will show the number of stops 
from maximum aperture and the actual aperture value must be read 
off the lens aperture ring.