Nikon D800 User Manual (en)

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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 (
0 213) 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 F
A) and the 
f-number must be read from the lens aperture ring.