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.

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.