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Originally Posted by Wheeler
John, the physical (??) image produced at the back of the camera isn't enlarged by the crop factor, infact it isn't changed at all from one you'd get at the same focal lengths with 35mm. You're simply looking at less of the lens circle than you are with 35mm. Any movement induced by shake at 300mm will be the same on 35mm as it is on digital.
Since we're looking at a smaller portion of the resultant image, it's important that it's sharp, there's no point effectively enlarging something that isn't, but if I took the effective crop into consideration when taking photos I'd get a hell of a lot of frozen propellor blades taking ground to air shots at 1/640.
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Yes I agree with you about the frozen prop. blades but my point about enlarging blur (due to camera shake) is, I believe still valid. To illustrate my point imagine a sensor measureing 1 mm x 1.5 mm and try blowing that up to A4. Blur due to camera shake would be magnified enormously.
John