Canon manual 36

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Shutter Speed Scale on the AT Dial There is a choice of 16 click-stop settings ranging from 1/1000 (sec.) to 30 (sec.) on the AT dial's shutter speed scale. The slow shutter speeds from 2 (sec.) to 30 (sec.) are marked in orange while shutter speeds from 1 (sec.) to 1/1000 (sec.) are in white. The white numbers on the scale are the reciprocals of the true shutter speeds so that a white 2 indicates a speed of 1/2 sec. while a white 1000 indicates a speed of 1/1000 sec. Be careful not to confuse the slower orange range with the faster white range.

Above the highest speed of 1/1000 is the “P” for programmed AE. Below the lowest speed of 30 is the “B” setting. The dial will not turn past the “P” or the “B”.

The “B” (Bulb) setting is intended for exposures longer than 30 sec. When the shutter speed is set at “B”, the shutter will remain open as long as you press the shutter

button. AE photography is not possible at the “B” setting. The aperture must be set manually. Remember that it is very important to use a tripod and a cable release, preferably with a lock, in long exposures to reduce the chance of image blur. Also, since long exposures present a real drain on the battery, it may be wise to carry a spare.

The A-1 has a hot shoe and PC outlet for an X-synch (flash synchronization) at 1/60 sec. (the position). This shutter speed need not be considered, however, when the A-1 is used with specified Canon flash units (see page 83).

Intermediate settings on the shutter speed scale cannot be used. However, if you accidentally set an intermediate shutter speed, the camera will automatically select the next lower or higher shutter speed as the effective shutter speed, and that shutter speed will be displayed when you take an exposure preview.

If you mistakenly try a time exposure on “bulb” while the lens is still at “A”, exposure will take place at the lens minimum aperture.

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