Nikon D750 Product Manual - Page 120
Non-CPU Lenses, Depth-of-Field Preview, Custom Setting e5-Modeling Flash
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A Non-CPU Lenses (0 427) 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 (0 235) 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. A Depth-of-Field Preview To preview the effects of aperture, press and hold the Pv button. The lens will be stopped down to the aperture value selected by the camera (modes P and S) or the value chosen by the user (modes A and M), allowing depth of field to be previewed in the viewfinder. Pv button A Custom Setting e5-Modeling Flash This setting controls whether the built-in flash and optional flash units that support the Nikon Creative Lighting System (CLS; 0 433) will emit a modeling flash when the Pv button is pressed. See page 353 for more information. 92