Aperture Ring And Manual Shutter Speed Ring; Setting The Selector Lever/Viewfinder - Olympus OM-2 Instructions Manual

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Aperture Ring
The opening in the lens diaphragm is marked in F stops on
the aperture ring. The higher the F number, the smaller the
lens opening (less light) and provides greater depth of field
than lower F numbers (see page 251.
When setting the aperture ring, you may use either the
click-stop positions or any in-between settings to obtain
precise exposure control.
NOTE: All lenses in the OM System (except certain special -
ized lenses) provide fully automatic diaphragm control al ·
lowing you to focus and compose your picture with t he
lens fully open . The diaphragm will automatically change to
the pre·selected F stop at the moment of exposure and im-
mediately re· open. when the exposure is completed.
1~
Manual Shutter Speed Ring
Shutter speeds engraved on the manual shutter speed ring
are used only for non -automatic camera operat ion with
zero-method exposure measurement. These 12 shutter
speeds are indicated as B, 1,2,4, 8 .... . up to 1,000.
B indicates "bulb" at which setting the shutter will remain
open as long as the shutter release button is held down. The
other engravings indicate fractions of a second; for example
"1" for 1 second, "2" for
1/ 2 second ... ... up to "1000"
for 1/1000 second. To set at "B", rotate the ring while
pressing the B I.OCK button at the lower left of the body
mount. Be careful that shutter speeds can be achieved only
at cl ick stop positions.
NOTE : Under AUTO exposure contro , irrespective of the
shutter speed setting, the electronic shutter automatically
selects the optimum shutter speed from about 120 seconds
(ASA 100, at normal temperature and humidity) to 111000
second except B, where the shutter works manually.