Olympus OM-2 - Manual (Page 48)

THE MOST IMPORTANT FEATURE OF THE OM-2-TTL DIRECT(OTF)LIGHT
Diagram of light path in conventional SLRs Diagram of light path in OM-2
Before shutter release
The instant the shutter has
been released
(A memory device controls
the shutter speed, based on
the light reading taken before
actual exposure.)
In the automatic mode, the OM-2 measures the
subject brightness very differently from any other
automatic camera — faster and with much more
accuracy. With the OM-2, light entering the lens
is measured directly at the film plane by the sen-
The instant the shutter has been released
sors at the precise moment the film is being ex-
posed. When sufficient light has reached the film,
the electronic brain senses the information and
instantly closes the shutter.
Light Sensor
Position
Before shutter release
Stray
Light
Light Sensor Position
47
MEASURING