Asahi Pentax ES Operating Manual Excerpts

INFRA-RED PHOTOGRAPHY

If you intend to take infra-red photographs, remember to use the infra-red index marked with an orange line or a small "R" on the depth-of-field guide.

First focus your lens on your subject. Determine the lens-to-subject distance from the distance scale. Then match your lens-to-subject distance to the infra-red index by turning the distance scale accordingly. For instance, if your subject is in focus at infinity, turn the distance ring and move the infinity (∞) mark to the index. The index marking on the Takumar lenses is based on the lens setting at infinity.

Reproduced for Historical and Reference Purposes by Paul M. Provencher

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