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I think I've convinced myself of the answer to this but I'll ask anyway. I know there is a rule-of-thumb to set your shutter speed to one over the lens' focal length or faster. So when I shoot with my 300 mm on my DX camera I set the shutter speed to 1/300 or faster. Does it make a difference if you are using that lens on an FX or DX camera? They say a 300 on a DX is equivalent to 450 on a FX. So should I be shooting 1/450 instead. I think the answer is no, 1/300 is correct, because 450 relates to FOV not true magnification. Yes/no?