Canon VI-T User Manual
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On the Depth-of-Field Scale (2) of all Canon
Lenses is the letter “ R.” This is for infra-red film.
When using this film, focus in the normal way.
Read off the distance of the object you are focusing
on as shown opposite the Distance Indicator
Mark on the Lens Distance Scale (3). Turn the
lens barrel until the distance reading is opposite
the “R” mark. Your lens is now focused for