Canon EF User Manual download pdf (Page 32)

I Locking-ln an Exposure Reading

In the majority of cases. Canon EF's Central

Emphasis. Metering system will give correct exposure

readings in AE photography. However, occasionally

you will encounter picture-taking situations which

require a departure from normal AE operation. For

example:

(1) Your subject is strongly backlighted or con-

trasts sharply with the background and will not

appear in the center of the picture.

(2) The entire scene is either extremely light, such

as a light colored subject in snow; or it is very dark,

such as a dark colored subject in deep shade or

against a dark background.

In the above cases, it is necessary to modify the

automatic exposure reading which the camera nor-

mally sets by itself. The Canon EF provides a

convenient way to do this by incorporating an AE

memory lock button on the left side of the camera

between the pentaprism and the ASA ring. By

holding in this button, you can lock the meter

needle of the camera at a particular f/stop while you

change the position of the camera (and hence the

view in the viewfinder). To produce a good exposure

in the first situation (1) described above, focus on

your main subject and center it in the viewfinder. If

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BASIC OPERATION

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Canon EF User Manual Page 32