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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 exposure is correct.
If, on the other hand, you have set an aperture on the dial, the camera selects the necessary shutter speed for correct exposure.