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Originally Posted by Wheeler
Duncan, I'll happily stand corrected, but since the crop factor is the result of a smaller effective lens circle rather than an actual lengthening of the focal length, isn't taking the crop into account when working out the shutter speed unnecessary?
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Because of the smaller effective lens circle the image (and therefore the blur) has to be enlarged proportionally more and that is why the effective focal length has to be used when working out the shutter speed. That's how I see it anyway.
John