Canon manual 17

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In the case of an FD lens which has a chrome Breech-lock mount ring or of an FL lens:

Mounting

1.Make sure the Breech-lock ring is locked so that it cannot be turned. It will not mount onto the camera otherwise.

2.Align the red dot of the Breech-lock ring with the red dot on the camera body above the camera mount.

3.In this position, fit the rear of the lens into the camera body and turn the Breech-lock ring clockwise until it is tight.

Dismounting

1.Turn the Breech-lock ring counterclock- wise until it stops.

2.Pull the lens out from the camera body.

When removing a lens, take special care not to damage the protruding pins and levers on the rear. With the exception of the Fish- eye 7.5mm lens, always put a lens down with the rear facing up.

Whenever you mount an FD lens on the A-1, its maximum aperture is automatically transmitted to the camera's AE circuit. Even if you switch to an FD lens of a different maximum aperture, the mounting procedure is the same as that described above and requires no adjustment.

All five AE modes are possible with an FD lens. See SETTING THE LENS FOR AE PHOTOGRAPHY. Of the five AE modes, only stopped-down AE is possible with an FL lens.

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