Olympus OM-2 - Shutter Circuit Diagram

THE T20 / 0M·2 WAY-FLASH PHOTOGRAPHY •
COULDN'T
BE SIMPLER AND MORE ACCURATE •
'---------"------' ~ =--~~~----'
Ordinary electronic flash
unit
and camera
(Normal automatic
flash operation)
---
--~
Pictu re angle
'"
light measuring angle
All required of the T20 is a flick of the on/off switch . The
rest is taken care by the OM-2.
• The dial settings required of conventional "auto" flash
units - ASA film speed setting, aperture setting and " X"
setting - are not needed with the T20 .
• Unlike conventional auto flash units wh ich regulate flash
emission
by an independent light sensor, the T20 utilizes
the OM-2's own built-in SBe light sensors, so that flash
acceptance angle always coincides
with the picture angle of
the camera lens.
•
The OM-2 shutter automatically closes at the instant the
flash exposure has been completed, eliminating camera
shake.
32
T20 and OM -2
(TTL Centralized Control
flash operation)
Picture angle
= light measuring angle
•
By the incorporation of an incorrect flash prevention
system, the electronic flash w ill not fire if the shutter speed
is faster
than the synchronizing range.
• Special
techniques such as diffused lighting is made
easily,
obviating complicated compensations and guess-
work .
• Usable
flash-to-subject distance range is greatly ex-
panded - from 25cm (F 16) to 16m (Fl . 2) with a guide
number of 20 (ASA 100, meters).