Stopped-down ae photography – Canon A-1 User Manual
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Stopped-down AE Photography
There are basically two cases which require
stopped-down AE photography (unless you
wish to operate in manual override). It is
necessary when you use any lens which is
not FD, such as FL or R lenses or the Reflex
Lens 500mm f/8 S.S.C. With the exceptions
of the FD-U extension tubes or Extender
FD 2x-A, it is also necessary whenever any
accessory is inserted between the camera and
any lens for increasing the lens’ foCtJ length
or for increasing lens extension for higher
magnifications in close-ups or photomacro-
graphy. It is, of course, also necessary in
photomicrography. It is possible, but not
necessary, to use the stopped-down AE
mode when an FD lens is mounted directly
onto the camera with no accessory in-
between. In the stopped-down AE mode,
exposure metering will be done not at full
aperture as usual but, rather, at the same
aperture that the picture will actually be