2. D850 Online Manual
3. Exposure
4. Shutter-Speed and Aperture Lock

Shutter speed lock is available in shutter-priority auto and manual exposure modes, aperture lock in aperture-priority auto and manual exposure modes. Shutter speed and aperture lock are not available in programmed auto exposure mode.

1. Assign shutter speed and aperture lock to a camera control.

   Assign Shutter spd & aperture lock to a control using Custom Setting f1 (Custom control assignment, 0 Custom Control Assignment).

2. Lock shutter speed and/or aperture.

   Shutter speed (exposure modes S and M): Press the selected control and rotate the main command dial until F icons appear in the viewfinder and control panel.

   To unlock shutter speed, press the control and rotate the main command dial until the F icons disappear from the displays.

   

   

   Aperture (exposure modes A and M): Press the selected control and rotate the sub-command dial until F icons appear in the viewfinder and the control panel.

   To unlock aperture, press the control and rotate the sub-command dial until the F icons disappear from the displays.