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.
30
Содержание PRO 645
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