Canon EOS REBEL T2I, Quick Start Manual

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Why manual exposure works best:
•
Using manual exposure is the only way to have control over the
shutter speed.
•
Auto exposure will change your shutter speed at random with varying
results. You may not notice the effect in a talking head video but the
shutter speed can greatly affect how movement appears in your
video.
•
Once the shutter speed is below twice your video frame rate, all
motion will be blurred. Once the shutter speed becomes very high
(1/250
th
of a second and above), motion may take on a staccato or
clockwork appearance. This has to do with image motion blur.