Canon A-1 - Manual (Page 36)

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 reci-
procals 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 im-
portant 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 ” , ex-
posure will take place at the lens minimum
aperture.
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