Canon FT QL - Lens with Manual Aperture Ring

ring to the index. The diaphragm will close down to the
pre-set f/stop only for the instant that the shutter is re¬
leased. Except for that instant, the diaphragm remains
fully open.
O Manually Operated Aperture: When the A-M ring is
^ set at “ M", the diaphragm closes down to any
desired f/stop by turning the pre-set aperture ring and
the depth-of-field at the time of shutter release can be
checked. When the A-M ring is reset at "A" the dia¬
phragm again returns to maximum opening.
Lens with Manual Aperture Ring
1 Pre-Setting of Aperture: Set the desired f/stop on
* the pre-set aperture ring to the index. Then set the
index of the manual aperture ring to this pre set f/stop.
The diaphragm will close down to the pre-set f/stop only
for the instant that the shutter is released.
O Manually Operated Aperture: When the manual aper-
^ ture ring is turned in the direction of closing down
the diaphragm, after setting the desired f/stop on the
pre-set aperture ring to the index, the diaphragm will
close down to the pre set f/stop and the depth-of-field
can be checked. The manual aperture ring cannot be
turned when set at the maximum f/stop.
■ Refer to pages 32-33 concerning depth-of-field.
Index
FL 50mm F 1.4
M Ring
FL 85nnm F 1.8
14