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partial pack : the top of the sheet of film would
be ejected as a dark slide and the counter would
registrer «10». After the last actual sheet is
used, the camera would still function until «0»
is reached. If a flash bar were attached, and an
unused bulb was available after the last film sheet
was used, attempting to make another exposure
would fire the flash.
The difference in the flash mode are :
inserting a flash bar closes S2, which activates
solenoid #2 to move the interceptor into position.
This controls the shutter blades according to
focusing : the closer the subject the more light
from the flash will bounce back. Therefore, the
smaller the permitted aperture.
At the end of the «Y» delay, a flash delay circuit
is activated, and when S4 switches from CB to
CA, Ca sends power to the flash circuit. During
the fixed flash delay, the photocell and S/T are
operative , so that if enough light energy is
collected before the end of the flash delay, the
blades will be closed as in ambient picture.
However, on newer cameras («P» configuration
shutters), the flash will fire whether or not
sufficient ambient light si available.
At the end of the flash delay (the blades at
this point are open to the aperture dictated by
focusing) power is removed from solenoid #2
and the discharge (flyback voltage) triggers the
flash circuit, firing the flash and starting the flash
time out interval (the fixed exposure time). If, on
early cameras, an ambient exposure has been
made, S/T-2 in the ECM receives the signal and
no flash or flash time out occurs.
At the end of the flash time out, the circuitry
energizes solenoid #1 which closes the blades.
if no flash has occured, caused by all the bulbs
having been used, no signal will be sent to
solenoid #1, and on early cameras an ambient
exposure will be made. If the S/T has not collected
sufficient light energy at the end of a fixed period
(20 seconds), the blades will automatically close.
On newer cameras, the exposure time remains
short and a black picture will result.
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