Canon manual 32

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The length of time that the light is allowed to strike the film is determined by the shutter speed. The relationship between shutter speeds is like that between f/stops. As you move from one shutter speed to the next higher shutter speed, exposure is halved. Your image is actually exposed by the opening of the shutter. Shutter speed can be controlled on the A-1 by turning the AT dial. Otherwise the camera controls it.

Now suppose that you have the camera set for a certain exposure value (EV), say the exposure you get with f/4 at 1/60 sec. There are certain other combinations of aperture and shutter speed which will give you the same amount of exposure as that above. Some of these combinations in this example include f/5.6 at 1/30 sec. and f/2.8 at 1/125 sec. You simply move up and down the f/number and shutter speed scales. It is not important to know this relationship when you use the A-1 in an AE mode. The camera will do the figuring for you. But it is an important photographic fact which you may find useful when you use the camera manually or in correcting exposure.

AE Photography

AE photography means automatic exposure. The camera is selecting either shutter speed or aperture or both for you.

The most obvious, unusual feature of this camera is the absence of the shutter speed dial which has been replaced by the AT dial. This dial allows you to set either shutter speed or aperture for any of five different AE modes.

Through-the-lens full-aperture metering

Shutter priority AE

Aperture priority AE

Programmed AE

AE flash photography

Through-the-lens stopped-down metering

Stopped-down AE

In shutter-speed priority AE, you set the shutter speed, and the camera automatically selects the necessary aperture according to lighting conditions for correct exposure. Shutter-speed priority AE, is applicable to most subjects but especially useful in action photography.

In aperture priority AE, you set the aperture while the camera automatically selects the necessary shutter speed for correct exposure. It is convenient for the various forms of still photography in which depth of field is of importance.

The camera automatically selects both

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