140ZShutter-Speed and Aperture LockShutter speed lock is available in shutter-priority auto and manualexposure modes, aperture lock in aperture-priority auto andmanual exposure modes. Shutter speed and aperture lock are notavailable in programmed auto exposure mode.1 Assign shutter speed and aperture lock to a cameracontrol.Assign Shutter spd & aperture lock to a control usingCustom Setting f1 (Custom control assignment, 0 305).2 Lock shutter speed and/or aperture.Shutter speed (exposure modes S and M):Press the selected control and rotatethe main command dial until F iconsappear in the viewfinder and topcontrol panel.To unlock shutter speed, press thecontrol and rotate the main command dial until the F iconsdisappear from the displays.Aperture (exposure modes A and M): Press theselected control and rotate the sub-command dial until F icons appear inthe viewfinder and the top controlpanel.To unlock aperture, press the controland rotate the sub-command dial until the F icons disappearfrom the displays.A See AlsoUse Custom Setting f3 (Shutter spd & aperture lock; 0 306) to keepshutter speed and/or aperture locked at the selected values.