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partial pack : the top of the sheet of lm 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 ash bar were attached, and an
unused bulb was available after the last lm sheet
was used, attempting to make another exposure
would re the ash.
The difference in the ash mode are :
inserting a ash 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 ash will bounce back. Therefore, the
smaller the permitted aperture.
At the end of the «Y» delay, a ash delay circuit
is activated, and when S4 switches from CB to
CA, Ca sends power to the ash circuit. During
the xed ash delay, the photocell and S/T are
operative , so that if enough light energy is
collected before the end of the ash delay, the
blades will be closed as in ambient picture.
However, on newer cameras («P» conguration
shutters), the ash will re whether or not
sufcient ambient light si available.
At the end of the ash delay (the blades at
this point are open to the aperture dictated by
focusing) power is removed from solenoid #2
and the discharge (yback voltage) triggers the
ash circuit, ring the ash and starting the ash
time out interval (the xed exposure time). If, on
early cameras, an ambient exposure has been
made, S/T-2 in the ECM receives the signal and
no ash or ash time out occurs.
At the end of the ash time out, the circuitry
energizes solenoid #1 which closes the blades.
if no ash 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
sufcient light energy at the end of a xed period
(20 seconds), the blades will automatically close.
On newer cameras, the exposure time remains
short and a black picture will result.