Olympus OM-2 - Aperture Ring and Manual Shutter Speed Ring; Setting the Selector Lever;Viewfinder

L- A ~ P _ E _ RT _ U _ R _ E __ R_ IN _G __ A_N_D_M_A_N_U_A_L __ S _ H _ UT ~ T _ E _ R __ S_ PE _E_D __ R_ IN _G ______ ~I !I
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 seco nd; 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 11100 0
second except B, where the shutter works manually.