Data function – Canon T 90 User Manual
Page 171
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Command Back 90
The Command Back 90 is an interchange
able camera back designed for exclusive
use with the T90. As the name “Command"
suggests, it not only records data but also
controls the T90 for various types of timed
photography.
The following operations are possible using
the quartz controlled Command Back 90:
DATA FUNCTION
1. Printing of the auto date up through the
year 2029. (automatic compensation for
leap years and long and short months)
2. Printing of the Day/Hour/Minute in a 24
hour format
3. Printing of an arbitrary 6-digit number plus
the letters A through F.
4. Printing of a frame counter number up to 4
digits.
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