Canon AE-1 Instructions Manual page 62

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
~ndex mark.
I
I
I
When photographing with infrared black
and white film, visible light rays must
be
kept
out by means of a deep red filter ( R l ) over
the lens. The position of the infrared index
mark
i s
fixed for infrared film most sensitive
to the 800mp wavelength and use of a red
filter. For example, the Kodak Film IR
135
and the Wratten Filter 87.
Please follow the directions of the
specific instructions of the film manufacturer
when performing infrared color photography.