Custom Setting f4: Shutter Spd & Aperture Lock
Shutter spd & aperture lock is an interesting function that allows you to lock the shutter speed at the currently selected value when shooting in Shutter-priority (S) or Manual (M) mode. You can also lock the aperture at its current value when you are shooting in Aperture-priority (A) or Manual (M) mode. This function does not apply to and will not work when shooting in Programmed auto (P) mode.
You will need to choose a shutter speed or aperture before using this function. The camera will lock the currently selected shutter speed or aperture until you unlock it later.
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