The old rule of thumb I learned in my youth about shutter speeds advises that we should use a tripod unless the shutter speed is at least 1 over the focal length of the lens. For example, using 50 mm lens I should be able to hand hold at 1/50th of a second. The other day, I hand held a one second exposure with a 200 mm lens that is tack sharp. Seven to eight stops of stabilization. Amazing!

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