Canon 155 A User Manual
Page 38
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pilot lamp glows, open the lens 1/2 to
a full f/stop. This correction is necessary
due to the fact that the lens is not yet
fully changed.
If you do not use the c
2
dculatof dial,
use the following guide number calculation
to determine the aperture:
aperture = guide number
shooting distance
When doing the math, make sure both
guide number and shooting distance
are in the same unit, whether meters or
feet. The guide number changes according
to film speed. It is 17 m for ASA 100 film.
If using the calculator dial, the guide
number is automatically adjusted when
the film speed is set on the flash.
When using the flash off-camera, use