Canon 199 A - Manual (Page 34)

Manual Aperture Setting by Disengaging the
Auto Flash Mode
Setting the aperture selector at the back to M
places the 199A in manual mode. Thereafter,
f/stops are decided from the guide number in
the same manner as when using an ordinary
electronic flash unit. The shutter speeds,
however, do not have to be adjusted because
they are automatically set. In the case of
AV-1, the Selector Dial serves as the usual
shutter speed dial. Ordinarily under this
method the f/stop is calculated by using the
guide number every time the shooting dis­
tance changes. Then the lens aperture is set
to this f/stop before shooting. The calculator
dial eliminates much of this troublesome
task.
Setting an Aperture * *
1. Set the aperture selector switch at the back
at M.
2. Be sure to also set the film speed.
3. Focus the camera on the subject.
4. Read the shooting distance on the lens.
5. Look for the same distance on the calcu­
lator dial.
6. Take note of the f/stop against that distance
on the calculator dial.
7. Set the lens to the f/stop taken from the
calculator dial.
8. Press the shutter release button after the
pilot lamp lights up and after it starts flash­
ing on and off.
* When an f/stop obtained seems to fall
between half-click stops, move the aperture
ring to the click stop on the brighter side.
* When you find it necessary to shoot
immediately after the pilot lamp lights up,
open your lens one f/stop to get correct
exposure as the flash unit is not yet fully
charged.
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