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instance normally, when the focus i s adjusted
at 5m on the distance scale, you turn the
focusing ring slightly so that the 5 on the
distance scale matches the red dot infrared
index mark.
When photographing with infrared black
and white film, visible light rays must be kept
out by means of a deep red filter ( R I ) over
the lens. The position of the infrared index
mark i s fixed for infrared film most sensitive
to the 800mp wavelength and use of a red
filter. For example, the Kodak Film IR 135
and the Wratten Filter 87.
When performing infrared color photo-
graphy, follow the directions of the specific
instructions of the film manufacturer.
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