That is absolutely true for shutter speed of 1/30s or over, but for shutter
speed of 1/8s or below, it won't work.
That sounds more to me like at higher shutter speeds you won't notice the
extra shake introduced by the hands, whereas at slower shutter speeds this
extra shake will become critically apparent. In other words, if this
theory has any validity it should work at all speeds. The fact is that it
is at the lower shutter speeds camera shake has it greatest effect. Indeed,
at much higher speeds a bit of shake won't be noticed at all, at least not
in casual inspection (to the human eye). This is why it's quite possible to
freeze the action at various shutter speeds (relative to focal length)
during hand-held sessions.
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