Canon FTb - Focusing and Distance Scales

lnf
rared
lndex
(
red
dot;
Index
(orange
line)
D
ista nce
Sca
le
The
distance scale
indicates the
distance between
the
focused subject
and the
film
plane.
The scale
is
neces-
sary
f
or checking the depth-of
-f
ield,
f
or
f lash
and inf rared
photogra ph
ies.
r
The
correct
position
of the scale
is in the
center
of
each value.
For
example, the correct
position
of
a two'
digit value is the center
of the two
figures.
Infrared Index
For
infrared
photography,
correction of the
distance scale
is
necessary because the focal
point
slightly
deviates
from
ordinary
photography.
Focus
f
irst in the ordinary manner,
then adjust the distance
scale to the
infrared mark
".
"
("
R
"
in
the case
of FL
lenses)
in red. For
instance, if the
distance scale
reads 1Om
af ter
focusing,
merely shif t the
10
scale
to
".
"
position.
The
position
of
".
"
on the
FTb
is
based
on
using
film
with
the highest
wave-length
sensi-
tivity
f
igure
of
80Om1r,
such
as Kodak
lR
135
f
ilm and
Wra tten 87
t
ilter.
Film
Plane lndicator
When focusing
is
done
by
actual measurement, measure
the
distance from
the
film
plane
indicator
and interpret
the
measured
distance
on the distance scale.
When
performing
close-ups,
macrophotography or
copy
work,
decide
the distance
of
the
camera
from
the subject
with
this indicator.
37
www.orphancameras.com