Canon AE-1 - Manual (Page 55)

stopped'ckhvn couplirHi levef become$ vtsiWe.
9 % ckm the red merk in (he cmr de^ribed
above.
The FO iensee mounted on the AE'1
should elweys be used with full aperture
metering. Stops>ed<lowr> metering vrill give
the wrorsg exposure.
( 1)
50
Manual Aperture Control
When accessories requiring manual
aperture control are used between the camera
tx>dy and a lens, lock the automatic aperture
lever in the manual position before mounting
the lens.
I
Lock for Manual Aperture Control {1)
For manual aperture control, push the
automatic aperture lever counterclockwise
until it stops and locks. When accessories such
as extension tubes are attached to a lens that
has been set for manual control, the dia*
phragm blades of the lens open or close as the
aperture ring is turned. To revert from marsual
control, reset the automatic aperture lever in
its original position.
2 Lock for Manual Aperture Control (2)
There arc some FD lenses with the
manual lock (ever requiring a different pro*
cedure for manual control setting. With these
particular lenses, the automatic aperture lever
must be turned fully counterclockwise while
the manual lock lever is brought to the "'L*'
position. Once (his has been done, when the