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Shutter
Supe
r Canomati
c Me
chanism
Through this mechan
is m,
the opening and clo sing of
the apertur
e
cannot b
e
seen with the human eye
at high shu
t
ter speed
.
However,
t
he mo
v
ement
can be seen w ith the e
y
e at B or slow speeds
.
The larger the aperture number
,
(e .g
.
smalle
r
lens
opening
,)
the less light
w
ill reach the film, as
y
ou
advance one stop on the aperture ring, the light
vol ume is reduced to one-half
.
Consequentl
y,
whe
n
you stop down one stop on the aperture stop
,
double the exposure time
.
if you stop down two
stops
,
you must increase the exposure time by four
times
.
Positions between numbers on the aperture
ring can be used
.
Depending on the lens
,
this halving
of
t
he light volume d
o
es not effectively apply bet-
ween full ope
n
and the
st
op next to it (e .g. F
1.
8
and F 2
)
Since
t
he Canonflex RM has a bu
i lt
-in
exposu
r
e meter, an approp
r
iate combination shu
tt
er
speed and lens aper
t
ure is automatically decided
.
button is pressed
is actuated
~Oh-8b9J·
Mirror
beg
i
ns
to snap
up
snaps
up
begins to return
returns
o@@o
Diophragm
begins to
close
closes down to
begins
to
open
opens to
full
pre.selected stop
ope
n
ing
8
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