9. The sequence for low-ambient conditions begins identically to the fill-flash sequence. The
flash is charged via S10 and the shutter blades open the same way. However, the flash is
fired by the internal clock reaching 74 ms, rather than by the photocell light measurement.
This happens because there is relatively little light passing through to the photocell.
10. Next, the camera logic asks whether the subject is NEAR or FAR. This information is
needed to properly set the electronics for low ambient pictures.
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