Stopped-Down Ae Photography - Canon A-1 Instructions Manual

Stopped-down AE Photography
There are basically two cases whic h require
stopped-down AE pho togr aphy (_unless yo:i
wish to operate in m anual overnde) .. lt
~s
necessary when you use any lens which is
not FD such as FL or R lenses
ot
the Re flex
Lens 5oomm f/8. With the exceptions
of the FD·U extension tubes or Extenders,
it is also necessary whenever any accessory
is inserted between the camera and a.-iy lens
for increasing the lens' focal length or for
increasing lens extension for higher magni·
fications in close-ups
or phot omacrogr aph y.
It is, of cour se, also n ecessary in photo·
mic rography. IL is possible, but
no~
neces·
sary, to use th e stopp ed-down AE mode
when an FD lens is moun ted directly onto
the camera with no accessory in-between.
In the stopped-down AE m ode, exposure
me tering will be d one n ot at full aperture as
usual but, rather, at the same aperture that
the picture will actually be taken.
-61 -
To set the camera in t h e stopped-down AE
mode when using a non-FD lens, sim ply fol d
an d push in the A· l 's stop-down lever.
When us ing an FD len s, first advan ce th e
film and t hen disengage t he lens ap erture
ring fro m t he "A" mark befor e you push in
the stop-down lever. If the film is
~ot
advanced before turning the aperture nng
from the "A" mark, the lens \vii.I slop down
only as far as the ap erture set for
l~e
previous exposure. It is impossible to pu.sh m
th e stop-down lever wh en an F D lens 1s set
a t
''~.:\..".
Wh en in t he stopped-down AE mode , it does
not ma tter whether the AE m o d e selector
is set to Tv o r Av. The camera will beh ave as
if it was in the aperture priori ty AF. mode.
You must select the aperture by turning the
lens aperture ring while the camera
will
auto-
matically select a shutter speed. When you
preview the exposure, only the shutter speed