Pentax MX - Pentax MX Infra-Red Photography

infra-red photography
If you intend to take infra-red photographs,
remember to use the infra-red mark indicated with
an orange line on the depth-of-field scale. First,
bring your subject into sharp focus. Then
determine the sub]ect-to-camera distance from the
distance scale on the lens. Then match your
subject-to-camera distance to the infra-red mark
by turning the focusing ring accordingly.
For instance, if your subject is in focus at infinity,
turn the focusing ring and move the infinity («)
mark to the infra-red mark.
• NOTE: An infra-red focusing adjustment H not
required when working with infra-red color film.