Canon QL19 - Manual (Page 15)

* When adjusting the simple exposure mark,
always make the adjustment by turning
the entire shutter ring. The setting may
be approximate. Set at a position where
the shutter ring catches the click stop.
Safety device against incorrect exposure
* To avoid setting the exposure conditions
beyond the working range of the EE,
the Under & Over Exposure Lock device
has been incorporated into the shutter
ring. When the shutter ring stops, do not
unduly try to make the rotation.
The Under & Over Exposure Lock catches
at the following positions:
Under ASA 80 1 sec.
For ASA 100 V 2 sec.
For ASA 200 1/4 sec.
For ASA 400 '/9 sec.
For ASA 800 Vis sec.
When wishing to click the shutter at a
slower speed, beyond the limit of the
Under & Over Exposure Lock device, the
lock may be freed by turning the shutter
ring while pressing the Under & Over Ex­
posure Lock release lever. In this case, as
the EE mechanism will not function, release
AUTO and set the lens aperture manually.