I grew up with film SLRs (full-frame, of course), and the rule of thumb was "the slowest shutter speed you should try to hand-hold is 1/your lens focal length in mm." e.g. 1/50 sec for a 50 mm lens.

Shutter speed makes or breaks a photo. It's the secret behind crisp, sharp images – and the magic of dreamy motion blur. But there are some myths about shutter speeds that you might have heard before, ...