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Stopped-down AE Photography
There are basically two cases which require stopped-down AE photography (unless you wish to operate in manual override). It is necessary when you use any lens which is not FD, such as FL or R lenses or the Reflex Lens 500mm f/8. With the exceptions of the FD-U extension tubes or Extenders, it is also necessary whenever any accessory is inserted between the camera and any lens for increasing the lens' focal length or for increasing lens extension for higher magnifications in close-ups or photomacrography. It is, of course, also necessary in photo- micrography. It is possible, but not neces- sary, to use the stopped-down AE mode when an FD lens is mounted directly onto the camera with no accessory in-between. In the stopped-down AE mode, exposure metering will be done not at full aperture as usual but, rather, at the same aperture that the picture will actually be taken.
To set the camera in the stopped-down AE mode when using a non-FD lens, simply fold and push in the A-1's stop-down lever.
When using an FD lens, first advance the film and then disengage the lens aperture ring from the “A” mark before you push in the stop-down lever. If the film is not advanced before turning the aperture ring from the “A” mark, the lens will stop down only as far as the aperture set for the previous exposure. It is impossible to push in the stop-down lever when an FD lens is set at “A”.
When in the stopped-down AE mode, it does not matter whether the AE mode selector is set to TV or Av. The camera will behave as if it was in the aperture priority AE mode. You must select the aperture by turning the lens aperture ring while the camera will automatically select a shutter speed. When you preview the exposure, only the shutter speed