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First cat pic is 1/8, second is 1/10s shutter; both are using a 9.9mm focal length.
The rule-of-thumb is that you're generally safe hand-held as long as the shutter speed is higher than that focal length of your lens - ie. 1/10s should be okay for a 10mm lens; handheld on a 250mm lens should be at least 1/250s shutter; and so on.
IS will usually get you an extra stop or two of latitude, so for example, you could get away with 1/60-1/125s shutter on that 250mm lens, or 1/3-1/5s on a 10mm lens.
Both the night shots, on the other hand, are 1s exposures, so a tripod is definitely called for...
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Last edited by Soundy; 06-18-2008 at 03:04 PM.
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