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mode:

A way of doing things. Exposure modes are pre-programmed, user-selectable ways of controlling the readings from the exposure system to meet certain subject or picture conditions. These include aperture-priority mode, shutter-priority mode, program-depth mode, etc. Autofocusing modes allow a choice of how the camera/lens will go about autofocusing.

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mode:

A setting that causes the camera to perform a specific function or operation.
glossaryofphotojargonfortravelers