Pentax K1000 - Range of Light Measurement

INFRA ·RED PHOTOGRAPHY
If you intend to take infra-red photographs,
remember
to use the infra-red index marked with
an orange line on the depth-of-field guide_ First,
bring
your subject into clear focus. Then determine
the lens-to-subject distance
from the distance scale
on the lens. Then match your lens-to-subject
distance
to the infrared 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 (00) mark to the index.
22.