A type of
photographer's
error that shows up as a
blurred image on a
negative when really the
subject was
still and in
focus. The
problem usually comes down to using too slow a
shutter speed when shooting hand-held (without the
aid of a
tripod).
The minimum shutter speed for shooting hand-held is dependent on a number of factors:
Ultimately, if you want to be fairly certain you can eliminate camera movement 95% of the time you should use a shutter speed of 1/30th or faster. 1/60th will guarantee it unless you're jumping about like a madman.