21. At this point, the blades are still open and the exposure is being made. The photocell
continues measuring light which now includes the light bouncing back from the flash. Next,
the camera must decide when to shut down the flash and when to close the shutter blades.
22. In the high ambient (Fill Flash) mode, the photocell makes the decision to shut down the
flash and close the shutter blades. It does this when it sees the remaining 25% of the light
required for a proper exposure. (This light is provided by the flash.) The camera logic
signals the flash to quench and commands the solenoid to close the blades.
23
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