D releasing the shutter, D. releasing the shutter, Releasing the shutter – Canon EF User Manual
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change to a lens of different focal length, the above
suggestions are not necessarily valid. A good rule of
thumb in determining the slowest shutter speed you
can safely hand-hold the camera with a particular lens
is to make a fraction representing this "safe" shutter
speed by putting a "one" over the focal length of the
lens. For example, when a 135mm telephoto lens is
mounted on the camera, the slowest hand-holdable
shutter speed you can use to achieve sharp photo
graphs is 1/135 sec. (135mm = 1/135 sec.). Set the
shutter speed dial at 1/125 sec., which is closest to
1/135 sec. This rule can be applied to all lenses, from
moderate wide-angle to super-telephoto.
D
Releasing the Shutter
Squeeze the shutter button gently, instead of
punching it. Also, try to coordinate your breathing
with the release of the shutter. A good time is the
instant between exhaling and inhaling (or vice versa)
when your diaphragm is at rest. Of course, when
shooting fast action, this coordination is not always
possible or even desirable. It is more important to
concentrate on capturing the action rather than on
the position of your diaphragm.