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•
Time exposure is also possible by using the
lockable cable release.
•
The" X" index is used for synchronizing an
electronic flash unit such as the Canon Speed-
lite.
Although the shutter speed at "X" is
1/
60 sec., it is equivalent to a very short ex
-
posure time during the flash of the flash unit
.
Aperture
Incoming light and depth-of-field are adjusted
by turning the pre -set aperture ring to the
desired
f/
stop.
•
As the
f/
stop value gets larger, the amount
of light reaching the film plane becomes cor
-
respondingly less.
For each
f/
stop the light is
reduced one· half.
Accordingly
,
when the aper
-
ture is increased by one
f/
stop
,
the
exposure
is doubled, and when it is increased by two
f/
stops the exposure is quadrupled
.
•
Certain
lenses, have
no
relation
to
the
lightness being halved between the maximum
and the next
f/
stops on the pre-set aperture
ring.
•
The pre·set aperture ring can also be set
between two
f/
stops
.
•
The ratio
between the aperture and the
amount of exposure
,
using f
/
2 as the basis
,
is as follows
:
Lens Aperture
1.2 1.4
1.8 2 2.8
3.5
4
5.6
8
11
16
22
Exposure Ratio
3
2
1.2
5 1
112 113
114
1/8
1116
1/32 1/64
11128
13
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