Rule of Thumb

USING A TELEPHOTO LENS

The longer the focal length of a lens, the more important it is to hold it steady, especially at slow ...

The longer the focal length of a lens, the more important it is to hold it steady, especially at slow shutter speeds. You can generally hand hold a camera with a shutter speed that is equal to the reciprocal of the focal length of the lens. Slower speeds require a tripod. — Jim Crissman, veterinary pathologist, Midland, Michigan

06/26/16

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