Olympus OM-2 - Page 43

MEASURING
.... ' 1/
~
0
-o~
.... / " ....
ell
Shutter
1/125 sec .
1
sec. 5 secs .1 0 secs.
20 secs .
Speed
I
1/2 sec .
I
,
,
I
at F1 .2
J)
Exposure range of OM -2 in atuomatic mode
Exposure range of conventional
AE SlRs ---.
... _ • ..... _--
Advantageous Points of Through-The-lens Direct
Light Measuring Method
1. The OM-2 sensors respond instantly to changes in the
light during exposure and feed back the information on
real t i me to the shutter control mechanism .
2. The sensors measure flash
intensity as it builds up and
cut off its I ight at sou rce when the correct exposu re
level is reached. (TTL Centralized Control Flash)
3. Even
during 5-frame-per-second motor drive operation,
the Method can insure correct exposure for each frame
individually .
4. The
Method operates accurately in far dimmer light
than other systems. ASA 100 film can be exposed for
up to 120 seconds at F1.2.
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[]
50 secs .
80 secs. 100 secs .
120 secs.
I
I
I I
~
5. The Method excludes all possibilities of stray light leak-
ing
through the camera eyepiece and distorting the ex -
posure reading.
6.
The Method gives cor r ect exposures even when the
clear-field type focusing screen is in use.