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Asahi Pentax ES Operating Manual Excerpts
Reproduced for Historical and Reference Purposes by Paul M. Provencher
http://whitemetal.com Not For Resale.
19
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.