Canon AE-1 - Manual (Page 113)

Data Back A
This is an interchangeable back cover
with a built-in data imprinting mechanism. It
can imprint the day, month and year on the
lower right hand corner of the photograph at
the moment of the shutter's release, as well as
other data to identify or classify the pictures
you take. It has letters and Roman numerals
for greater versatility and convenience.
Canon Bellows FL
This is an adjustable bellows for high-
magnification photography. Magnification is
adjusted within the range of about 0.7 to 3
times the size of the subject when it is used in
combination with a standard lens.
The built-in semi-automatic aperture
mechanism automatically closes the
diaphragm at the time of shooting and makes
the Bellows FL almost as easy to use as a fully
automatic lens. Focusing is performed with a
bright field of view. It has a built-in strut to
prevent blur. The Slide Duplicator FL for
duplicating slides can be attached to the end
of the Bellows.
The use of a macro lens especially cor­
rected for close-up photography is particularly
recommended
for photography with the
bellows.