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Originally Posted by en830
It’s much harder to hand hold a large professional camera with big lens, rule of thumb (but not always) is that the shutter speed should match the focal length of the lens i.e if shooting at 400mm 1/350 -1/500, however lower speeds can be achieved with some practice, especially if panning.
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That was true with film, but for APS sensors the rule of thumb becomes:
T > 1/(1.5*FL).
where T is the exposure and FL is the lens focal length.
Leif