At dial – Canon A-1 User Manual

Page 62

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AT Dial

This dial works in conjunction with the AE

selector. When the AE selector is set at Tv, it

shows the shutter speed scale. When the AE
selector is set to Av, it shows the aperture
scale.

To operate the AT dial, first slide down the

AT dial guard which is designed to prevent
accidental movement of the dial. Depending
on the setting of the AE selector, turn the
AT dial until it click stops at the exact
aperture or shutter speed desired so that the

setting is aligned with the index mark. The

AT dial will not turn past the highest and
lowest limits of each scale.
The figure set on the AT dial has priority in

determining the exposure. If, for example,
you have set a shutter speed on the dial, the

camera

balances

the

aperture

against

the

shutter speed you have selected until ex

posure is correct.

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