Using The Infrared Index - Pentax 26755 - SMC P FA 645 Zoom Lens Operating Manual

Interchangeable lens
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If you use infrared film with an R2
or O2 filter, the point of focus differs
from normal shooting (with visible
light). This means the point of focus
must be corrected.
* Infrared film cannot be used with
the MZ-S, MZ-60, and
eras since these cameras use
infrared light to detect film transport
operations.

Using the Infrared Index

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When the subject is in focus in the view-
finder, note the point of focus on the
distance scale (shown in the left illustra-
tion). Then turn the focusing ring so the
respective point of focus on the distance
scale is aligned with the infrared index
mark, as shown in the right illustration.
* Before turning the focusing ring, set
the focus mode to manual focus.
* To determine the proper exposure,
refer to the film's instruction manual.
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