Manually operated aperture – Canon QL19 User Manual
Page 29
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MANUALLY OPERATED APERTURE
When the AUTO mark of the Canonet QL
has
been
removed,
the
automatic
mecha
nism ceases to function It is then possible
to manually operate the aperture and shut
ter
speed
separately
Accordingly,
when
the
effective
use
of
the
shutter
speed
or
aperture is desired, or in case it is essential
to expose the dark subject for a long time,
as well as to regulate the aperture for flash
photography,
the
manual
mechanism
should
be
employed
Everything
else
is
operated
as usual.
The
aperture
regulates
the
amount of light.
As
the
numerical
value
increases,
it
gets
darker.
For
each
stop
of
the
index,
the
light decreases by one-half. Thus, when the
index is lowered by one stop the exposure
time
must
increase
two
times,
two
stops
by four times The ratio between the aper-