Types
There are two distinct modes of live-preview, with only a few manufacturers offering both in their digital cameras.
The first is a more rudimentary type of live preview that displays the overall framing on an electronic display and allows a preview of what the camera's sensor will detect before the photograph is taken. This can be particularly helpful when the lighting conditions are too dark for an optical viewfinder. This type of live preview is the autogain/framing live view type (or framing priority display). This requires traditional means of exposure determination requiring metering of the light coming through the lens, and interpreting the light intensity indication on an automatic light meter, and then adjusting exposure parameters for a desired effect.
The second is a more sophisticated type of live preview that displays the exact exposure 'look' on an electronic display and allows the photographer to alter the exposure look via adjustments to parameters such as shutter speed, film speed or ISO, and aperture, before the photograph is taken. This second type of live preview is the exposure simulation live preview type (or exposure priority display). This type of live preview eliminates reliance on traditional light metering usage.
Many modern bridge and compact cameras with movie mode have only an automatic exposure and limited exposure compensation control, and live view that is primarily for framing only.
Read more about this topic: Live Preview
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