Canon FD Lens Manual Book page 43

Speedlite 277T/299T
In the "PROGRAM" mode, the 277T and
the 299T set both the shutter speed and
aperture automatically. In the "F.NO.SET"
mode, you can choose from a wide range
of eight apertures between f/2 and f/22.
This enables you to take flash recycling
time and depth of field into consideration.
277T has a guide number of 25 (ISO
100-m). 299T has a guide number of 30
(ISO 100-m) and additional functions of
two MANUAL modes, a bounce flash and a
built-in zoom mechanism.
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Data Back A
This accessory has numerous applica-
tions, from scientific to commemorative
photography. The Data Back A makes it
possible to record information such as
the day, month, and year directly on the
film the moment the picture is taken; it
can be used with the A-1, AE-1 PRO-
GRAM, and AE-1. Easily installed in place
of the camera's regular back cover, its
three dials can be set to automatically
record a maximum of six numerals or
characters. Manual recording is also
possible.
Command Back 70
Designed exclusively for the Canon T70,
the Command Back 70 is equipped with a
command function that controls the
camera in various timer modes such as a
self-timer mode, interval timer mode, long
release timer mode and frame counter set-
ting mode. It also allows you to record data
such as the day, month, year, time or frame
counter directly on the film. The Command
Back 70 can be programmed by combin-
ing the modes of the timer control function
and using them together with the data re-
cording function.
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