Infrared photography – Canon Model 7S User Manual
Page 63
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Infrared Photography
The letter "R” is on the depth of-field scale of
all Canon lenses. This is for infrared film. When
using this film, focus in the normal way. Read
off the distance of the subject you are focusing
on as shown opposite the distance indicator mark
on the lens distance scale. Turn the lens barrel
until
the
distance
reading
is
opposite
the
"R”
mark. For example, when the subject you have
focused on is 25-feet away, turn the lens barrel
until
the
figure
25
is
opposite
the
“R”
mark.
Your lens is now focused for infrared photography.
34
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