Canon EOS-3 Instructions Manual page 109

This is convenient if you develop the film yourself.
• If 1 is set, the shutter speed will always be 1/8000 sec. if you release
the shutter with the camera back open.
This is effective if you want to set the film speed yourself.
You can be relieved from setting the film speed each time you load film.
This is effective when you want to focus and meter at different portions of
the scene.
This is effective when you want to stop AI Servo AF operation
momentarily.
If an obstruction comes between the camera and subject, it will not throw
off the AF. The exposure is set at the moment of exposure.
When you use AI Servo AF, you can toggle between AI Servo AF and focus
lock just by pressing the <
moving and stopping repeatedly. The exposure is also set at the moment
when the picture is taken. Thus, the focusing and exposure are always set
correctly and all you do is wait for the right moment to capture the shot.
Remarks
> button. This is useful for subjects which keep
Custom Function Settings
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