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Infra Red Fotografy
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 infra-red photography.
