Adjusted with lens aperture ring
Controls the action of the AE-L/AF-L button
Allow the aperture to be selected using the aperture ring on a lens rather than the sub command dial ...
The numbers on the lens aperture ring and the camera's LCD (where applies) that indicate the relative size of the lens aperture opening.
F-number : The numbers on the lens aperture ring and the camera's LCD that indicate the relative size of the lens aperture opening.
In Av mode you set the lens aperture using the lens aperture ring and the camera's aperture setting to 1.0 and then camera will set a shutter speed automatically.
F-number (See also: Aperture) The set of numbers on the lens aperture ring indicating the relative size of the lens aperture opening.
Preset aperture controls have taken several forms; the most common has been the use of essentially two lens aperture rings, with one ring setting the aperture and the other serving as a limit stop when switching to working aperture.
 See also: Lens, Aperture, Exposure, Focus, Format
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