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The
lens
aperture
ring
is engraved with
F-numbers from maximum aperture through
16. The lens opening is set by rotating this until
the desired number is aligned with the index (•
or ♦ )
or
appears
above
the
frame
in the
viewfinder.
When other conditions remain constant, light
passing through a lens generally decreases 50
percent for every fuM-stop increase in F-number
(for example, when the aperture number of a fast
lens is increased from F5.6 to F8, the light
passing to the film decreases by 50 percent).
As the aperture figure decreases, the light
F-No. I
1.2
14
2
2.8
4
5.6
8
H
16
|
passed increases. The theoretical 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 303 and MC Rokkor lenses have built-in
compensation for this to give you
most satis¬
factory exposure.
NOTE:
• "Click"
stops
are
provided for half-stop
aperture settings. Intermediate shutter speeds
cannot be set.
• The figure "B" on the shutter speed dial is
used when an exposure duration of over 1
second is required. The shutter will remain
open while the shutter 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.
• 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.
• The shutter speed at which the camera is set
can be seen from the scale visible below the
frame in the viewfinder. With most lenses,
the
F-number set is displayed above the
viewfield In the finder.
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