It has to do with angle of view. If your hand shake is, say, 1/2 degree of angular movement, that's a significant added blur to a lens with an angular field of view of, say, 20 degrees and insignificant to one with, say, a 100 degree angle of view.
R.
And, btw, you need to multiply the focal length of the lens by your crop factor if you're not FF: i.e., my 200mm lens is 320mm on my 20D, as far as angular coverage goes, so my reciprocal is 1/300, not 1/200.
R.
Message edited by author 2006-05-11 21:37:05.
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