41. For low light FAR pictures, the blades travel even farther. First, there is a very small
amount of light passed through the first photopic aperture. Next, a very small amount of
light passes through the infrared aperture. Finally, the blades open fully and a large amount
of visible light passes through the second photopic aperture. The exposure shutdown is
dependent on the measurement of this combination of light (or on clock time-out).
42. The flash may be bypassed on those rare occasions where it is not desired. This is pretty
much limited to taking pictures in daylight through a window. In this condition, the flash
can be prevented from firing by pressing only the back part of the exposure button.
Exposure shutdown is determined by the photocell seeing 100% of the light required for a
proper exposure or by the internal clock timing out at 396 ms.
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