Quote:
Originally Posted by A.CSIKY
Congratulations on the "once in a blue moon" image. The old mechanical shutter guideline for shutter speeds with long lenses was 1 over focal length, e.g. for a 500 mm lens 1/500 would be the slowest recommended shutter speed. Of course shutter speeds don't corelate exactly with lens focal lengths, but you get the idea -- 1/250 would probably be fine with a 300 mm lens.
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You're forgetting to add in the sensor size factor. The 1/focal length guide applies to film photography, so the focal length used should be the 35mm effective focal length. On an XT, the 300mm lens will have the same FoV as a 480mm lens on a 35mm camera, so the 1/focal length guide indicates a minimum shutter speed of 1/500 sec.
Quite interesting that
ckodonne reports the same minimum shutter speed for his 300mm lens!