Infrared index, Distance scale – Canon IV-S2 User Manual
Page 15
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Infrared Index
R marking indicates the position at which focusing should be set when using an
infrared
film.
Be
sure
to
use
proper
infrared
filter which is reco.mmended by
manufacturer of infrared films, After accurate
focusing is done in the usual man
ner read the object distance off the Distance Scale
of the lens. Then turn the lens
so that the object distance will be exactly opposite
the R index mark. The lens is
now in focus for infrared photography.
Distance Scale
Index Marie
When accurate focus (see page 10) has been
made
on
any
object,
the
actual
distance
from
the
film*
to
the
object
is
shown
by
the
Distance
Scale
which
is
marked
from
3.5 to infinity (oo) in feet. Lenses with metric
scales are provided when specially ordered.
*Shown by fhe Red Doi near the Accessory Clip.