Canon AE-1 User Manual
Page 102
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focused distance with this red dot.
For instance normally, when the focus is
adjusted at 5m on the distance scale, you turn
the focusing ring slightly so that the 5 on the
distance scale matches the red dot infrared
index mark.
When photographing with infrared black
and white film, visible light rays must be kept
out by means of a deep red filter (R1) over
the lens. The infrared index mark is engraved
in a position based upon the conclusion
arrived at through experiments that the film
most senstive to the SOOrry/ wavelength is
to be used with a red filter. For example, the
Kodak Film 1R135 and the Wratten Filter 87.
Please
follow
the
directions
of
the
specific instructions of the film manufacturer
when performing infrared color photography.
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