Infrared light rays - being of longer wavelength - focus at a slightly dif- ferent plane and require the follow- ing adjustment:
1.Note the Red Index Mark against which you read your distance scale. The red infrared index mark is slightly to its right.
2.After focusing in the usual man- ner, read the distance scale and move it to the right to line up with the infrared index mark.
* For proper filter and exposure information be sure to consult the instructions enclosed with in- frared film.
* The A300mm f/2.8 APO lens for 645, being also corrected for in- frared light rays, does not need an Index Mark for infrared.
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