The AE-1 has manual setting by pressing the A-button on the FD-lens aperture ring and setting it on any of the indicated apertures.
The automatic diaphragm will still be activated (diaphragm will only close to pre-set value during exposure)
For DOF-control you have to set aperture and then press the DOF-preview button left of the lens.
One of the best sources of Information on Canon cameras and lenses with FD-mount can be found here
Last edited by AgX; 11-10-2011 at 12:31 PM. Click to view previous post history.