Nikon D500 User Manual

Page of 428
250
Non-CPU lenses can be used in exposure modes A and M, with 
aperture set using the lens aperture ring. By specifying lens data 
(lens focal length and maximum aperture), the user can gain 
access to the following CPU lens functions.
If the focal length of the lens is known:
• Power zoom can be used with optional flash units
• Lens focal length is listed (with an asterisk) in the playback 
photo info display
If the maximum aperture of the lens is known:
• The aperture value is displayed in the control panel and 
viewfinder
• Flash level is adjusted for changes in aperture if the flash unit 
supports 
qA (auto aperture) mode
• Aperture is listed (with an asterisk) in the playback photo info 
display
Specifying both the focal length and maximum aperture of the lens:
• Enables color matrix metering (note that it may be necessary to 
use center-weighted or spot metering to achieve accurate 
results with some lenses, including Reflex-NIKKOR lenses)
• Improves the precision of center-weighted and spot metering 
and i-TTL balanced fill-flash for digital SLR
Non-CPU Lenses