Olympus OM-2 - Cautionary Notes

~ D _ E _ P _ T _ H __ OF __ F _ IE _ L _ D _ S _ C _ A _ L _ E ~ __ ____ _ P_R_ EV _I_ EW __ B_U_T_T_O_N ____ __ ~l ll
The double series of numbers engraved on the depth of field
scale represents F stops: F4 , Fa, and F16 . Once you have
focused
on your subject, all objects within the distance range
indicated on the lens distance scale between the marks for
the F stop you have selected will have acceptable sharpness.
For example, in the above picture, the camera-to-subject dis-
tance
is 3m (10ft.) and the lens is set at F 16 . If you read the
distance scale at the points opposite the engraved "16" on
both sides of the reference dot, you will find that the depth
of field is from 1. 9m (6ft.) to 7m (23ft.) .
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When you wish to see which objects fall within the acceptable
zone of sharpness (depth of field), press the preview button
on your lens. The diaphragm of the lens wi ll stop down to
the preset F stop enabl ing you to see the depth of field in
the viewfinder .
CAU T ION : If you jerk the preview button while depressing
the shutter release button halfway down, the shutter might
get released .