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

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Zoom Lens Infrared Index

With a zoom lens, the focusing cor-
rection amount for infrared film shoot-
ing varies depending on the focal
length.
As shown in the illustration, zoom
lenses have an infrared index.
Correct the focus with respect to the
focal length used.