Nikon 13187 User Guide (en)

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P, S, A, and M Modes
P
SA, and M modes offer different degrees of control over shutter 
speed and aperture.
A
Lens Types
When using a CPU lens equipped with an aperture ring (
0 287), lock the aperture ring at the 
minimum aperture (highest f-number). Type G lenses are not equipped with an aperture 
ring.
Non-CPU lenses can only be used in modes A (aperture-priority auto) and M (manual), when 
aperture can only be adjusted using the lens aperture ring. Selecting any other mode 
disables the shutter release.
A
Non-CPU Lenses (
Use the lens aperture ring to adjust aperture. If the maximum 
aperture of the lens has been specified using the Non-CPU lens 
data
 item in setup menu (
0 172) when a non-CPU lens is attached, 
the current f-number will be displayed in the viewfinder and 
control panel, rounded to the nearest full stop. Otherwise the 
aperture displays will show only the number of stops (
F, with 
maximum aperture displayed as 
FA) and the f-number must be 
read from the lens aperture ring.