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Choose the method used to adjust aperture when using lenses with no aperture rings.

[AUTO + MANUAL]
Rotate the command dial to choose the aperture. Rotate past minimum aperture to choose [A] (auto).
[AUTO]
Aperture is selected automatically; camera functions in exposure mode [P] (program AE) or [S] (shutter-priority AE).
[MANUAL]
Rotate the command dial to choose the aperture; camera functions in exposure mode [A] (aperture-priority AE) or [M] (manual).

Aperture can not be adjusted while the view through the camera lens is zoomed in.