Canon AE-1 Manual page 31

The Winder A has an upgrade later in Winder A2 (Introduced with the AE-1 Program in
1981) which can be used on the earlier Canon A-1 and all other models within the A series
(As well as the flagship model, Canon New F-1!). It is also compatible with the AE-1.
However, the AE-1 was not designed to use with the later Motor Drive MA, but the upgrade
AE-1 Program was able to share with the Motor Drive MA which primarily designed for the
Canon A-1.
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.
Canon Bellows FL Older (And cheaper) FL bellow can be considered as accessory. 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.
Furthermore, with the Power Winder A you can catch
subjects' movements and changing expressions because
you are able to take continuous or single frame
photography at your pleasure. When you perform
continuous photography, the Power Winder A couples
with shutter speed from 1/60 to 1/1000 seconds while, in
single frame photography, any shutter speed can be used.
It has letters and Roman numerals for greater versatility and
convenience.
Warning
make a purchase at the used market - the input dial of the original databack for
'Year' 'expired' around 1987).
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.
:
(Make sure you understand the databack before you