BKT = Bracketing
The technique took some photos with the same frame (usually the same 3 photos) but has a different setting (usually exposure). Often used to generate the HDR image. For example photo 1 -2 exposure level, exposure level of 0 photos 2, photos 3 +2 exposure levels. Surely we should also shutter button press three times to be the result of three photographs, but are usually so quick orang2 often use burst mode, so press the shutter button 1X, automatic three times a snap.
AE-L = Auto Exposure Lock
When do bracketing, AE-L function to lock the exposure levels we have set.
AF-L = Auto Focus Lock
When do bracketing, AF-L function to lock the focus distance, so that the focus does not shift (eg object 1 meter in front of focus, the focus will be kept locked at a distance of one meter, because usually prefer auto focus shifted when the shutter button is pressed half again)
Source : www.kaskus.us
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