I III:! Il:!lI:>aper rure
rtllg
IS eriqraveo
WHn
r--
nu mbers
from
maximum
aperture
through
16.
The lens opening is set by rotating
this until the
desired
number
is aligned
with the index
(e
or
.1.
When other conditions
remain constant,
light
passing
through
a lens generally
decreases
50
percent
for every full-stop
increase
in F-number
lfor example.
when the aperture
number
of a
fast lens is increased
from
F5.6 to FB, the light
passing to the film decreases
by 50 percent).
I-\S
me
apertu re ngu re
decreases,
the
light
passed
increases.
The
thaore tiea:
relation
be.
tween aperture
and light volume
is shown in the
diagram.
In practice,
this
varies
somewhat
at
large or maximum
apertures,
but
your
SR-T
101 and
Me
Rokkor-X
lenses have built-in com-
pensation
for this to give you most satisfactory
exposure.
NOTE:
· "Click"
stops are provided
for half-stop
aper-
ture settings.
Intermediate
shutter
speeds can-
not be set.
· The
figure
"8"
on the shutter
speed
dial is
used
when
an exposu re duration
of over 1
second
is required.
The
shutter
will remain
open wh iIe the shu tter release is depressed.
· The red figure "60"
on the shutter
speed dial
indicates
the
maximum
shutter
speed
to be
used in conjunction
with electronic
flash.
· The shutter
speed at which
the camera
is set
is shown on the shutter
speed scale visible in
the viewfinder.
· Since
light striking
the film is affected
by a
combination
of aperture
and
shutter
speed,
exposure
can be adjusted
by changing
either
or both of these settings.
F·No.
Theoretica
Light
Volume
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