Canon T 90 - Manual (Page 154)

4. Shooting with Infrared Film
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When you load the T90 with black and white in­
frared film, it is necessary to make a slight ad­
justment in focus. A red infrared index is en­
graved on most Canon lenses for this purpose.
1) Focus as usual looking through the view­
finder.
2) If, for example, the lens is focused at 10 m on
the distance scale, turn the focusing ring to
align the 10 m mark with the red dot.
3) Release the shutter after making this
correction.