to an adequate level to hold the solenoid after the high-current circuit has completed the solenoid operating function and switches on the motor drive circuit. Thus, the shutter will remain closed, with minimum battery drain.
Light entering the lens is now cut off and the reflex mirror is swung upward to picture-taking position. The electronic latch (activated by opening S5) assures that the sequence will be completed even if the operator removes his finger from the exposure button, S1.
When the mirror swings up, a mecchanically operated switch (S3) actuates a «Y» delay circuit (40 milliseconds) (Figure 1-12) so that the shutter will not function until the mirror bounce has subsided. At the end of the delay period the electronic circuitly removes the power from the soleniod and the opening spring sets the shutter blades in motion toward the full open position. At the same instant an electronic switch opens and starts the integration cycle. The integration cycle is that period during which the total amount of light (intensity and duration) reaching the photocell is transformed electronically to regulate the lenght of time the fiml is exposed. The shape of the opening in the shutter blades and the
motion of the blades is such that all of the factors involved are continously variable throughout the exposure period. this fact, however, is a design consideration and should not confuse the theory of the shutter operation from a maintenance point of view.
When the camera completes all off its automafed functions and the release button has been released, all voltage is removed from solenoid #1 and the shutter opens in preparation for the next exposure.
It should be noted that under extremeley low light conditions, the shutter will closed completing the exposure cycle in 14 to 30 seconds whether a suitable exposure has produced or not.
C. SHUTTER DESCRIPTION (FLASH MODE)
The special ten-shot flash bar is equiped with a shorting bar so that when the bar is inserted, two contacts within the camera is shorted. This switch is identified as S2. When S2 is closed, the shutter electronic circuit detects that a flash bar is in place and ready for firing. In general, the sequence of the functions remains the same as for ambient light operation with the following exceptions :
