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M = Manual: You set aperture and shutter speed manually.
AV = Aperture
Priority: This controls depth of field. Wide aperture (eg F/2.8) keep
the whole scene sharp.
Tv = Shutter
Priority: Let you control how long the shutter stays open for. Faster
shutter speeds freeze motion; slower ones blur water or motion, for
example.
P = Program：Sets
both the shutter speed and aperture automatically, but still allows you
to adjust the exposure and tweak other important creative settings.
A = Auto: The
camera sets both the shutter speed and aperture. These is no access to
exposure adjustment or other key settings.
SCN = Scene Mode:
These fully automatic modes choose settings suitable for specific
subjects and shooting situations, such as portraits, but you can’t
change many settings.
