Canon manual 33

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aperture and shutter speed in the programmed AE mode. This mode is helpful when your only goal is correct exposure and neither depth of field nor control of movement are very important in the picture. It is the easiest mode for the beginner.

In stopped-down AE, you set the aperture manually on the lens aperture ring while the camera automatically selects a shutter speed for correct exposure. This is a big advantage when using non-FD lenses and in specialized areas of photography such as photomacrography and photomicro- graphy.

AE flash photography is possible with the Canon Speedlite 133A, 155A, 177A, 188A, 199A, 533G or 577G. In this mode, the camera sets both aperture and shutter speed automatically, eliminating any worries about guide number calculations and flash synchronizing shutter speeds.

The first three AE modes discussed above are explained in more detail in the following sections. For more information concerning the stopped-down AE and AE flash modes, please refer to the section entitled SPECIAL-

IZED PROCEDURES.

Please note that shutter priority AE, aperture priority AE, programmed AE and AE flash are possible only with an FD lens and only when the lens aperture ring is set to the “A” mark. See SETTING THE LENS FOR AE PHOTOGRAPHY.

Setting the Lens for AE Photography The first four AE modes described above, i.e. shutter priority AE, aperture priority AE, programmed AE and AE flash photo- graphy, are performed with full aperture metering through the lens. This means that the diaphragm is fully open during metering for easiest viewing and opera- tion.

For correct operation in these four full- aperture metering AE modes, only an FD lens can be used and the lens aperture ring must be set to the “A” mark. To do this, simply hold in the AE lock pin on the lens while turning the aperture ring from the minimum aperture to the “A” mark. This can be done either before or after the lens is mounted on the camera. At the “A” mark, the aperture ring is locked and cannot be turned to any other setting. Reverse the procedure to disengage the aperture ring from the “A” mark.

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