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Message: <blockquote data-quote="mikew_RIP" data-source="post: 685618" data-attributes="member: 14174">The basic idea of shutter speed = to focal length is a good starting point, i do however struggle to see the need in most cases to increase it due to sensor size, a 500mm lens is a 500mm lens on any sensor size its only the FOV that changes.To explain my reasoning you put a 500mm lens on a FX OK I/500th as  starting SS, now the center DX area of the FX sensor is seeing the same 500mm FOV the DX sensor would, do you increase your SS because of that.Things are different if you take pixel density rather than sensor size into account, a DX sensor with a higher pixel density may require a pro-rata higher shutter speed. Just my thoughts</blockquote>