Selecting The Shutter Speed - Canon AT-1 Instructions Manual

Shutter and Aperture
The opening of the shutter letting light
in on the film is called an exposure. The
amount of light striking the film i s controlled
by the lens aperture, while the length of time
that light i s allowed to strike the film is
controlled by the shutter.
Shutter Speed Dial
The shutter dial is used to adjust the
shutter speed. It allows for speed settings in
the range of 2 seconds to 111000 of a second.
When the shutter speed i s advanced to the
next larger number, the exposure time is cut
in half. The shutter speeds on the dial are
typically the reciprocals of the true shutter
speeds. For example, 125 and 250 on the dial
represent shutter speeds of 1 11 25 and 11250
of a second. only in the case of the orange
"2" is the shutter speed actually as indicated
on the dial, i.e.,
2 seconds. The "B"
(Bulb)
setting i s used for long exposures where a s
long as the shutter button is pressed down,
the shutter will remain open.
The shutter speed dial cannot be set to an
intermediate position.
Brightness
\
I
Indoors
I
1 / 3 0 to 1/60
I
1
Outdoors
1
1 / 1 2 5 t o 1 / 2 5 0
1
Mid-summer Beach Or
Snow-coverd Mountains
Selecting the Shutter Speed
Shutter speed is determined in accor-
dance with the brightness of the scene and the
speed with which the main subject is moving.
You can use the above table as a general guide