Distance scale, Depth-of-field scale – Canon AT 1 User Manual
Page 102
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Distance Scale
The distance scale is for distances
measured from the film plane. This scale is
not generally used except for confirming the
depth-of-field,
performing
guide
number
calculations in flash photography, or photo
graphing with infrared film.
Read one-digit distances in the middle of
the number marked on the scale. Two-digit
distances should be read at the point in the
middle of the two digits.
Depth-of-Field Scale
You can determine the depth-of-field by
checking the depth-of-field scale and the
distance scale on the lens barrel. Both are
closely interrelated.
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