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Low Дмз/мг


27. For NEAR subjects the logic instructs the clock to stop the exposure at 124 ms after the blades open. For FAR subjects the clock will time-out at 396 ms to stop the exposure.


28. However, the ending of the exposure is also subject to the photocell light measurement. In other words, for a Low Ambient NEAR or FAR picture, there is still a race between the photocell and the clock to shut down the flash and close the blades.




29. In low ambient NEAR conditions, the flash will shut down and the blades close either when the photocell has seen 100% of the light necessary for a proper exposure or when the clock times-out at 124 ms.

LOIVAMB/ЖГ

ЮОУ'оя 396ms

30. In low ambient FAR conditions, the flash will shut down and the blades close either when the photocell has seen 100% of the light necessary for a proper exposure or when the clock times-out at 396 ms.




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31. The different clock settings for Low Ambient conditions are called the DUAL TIME-OUT SYSTEM. They allow long time-outs for distant, low-light scenes such as a sunset or an auditorium shot, or limit the length of the exposure for close-in scenes to minimize camera or subject motion.


32. So far weve talked about the photocell measuring scene light to control the exposure, but we havent mentioned the most significant part of the light measurement system: Infrared Sensing.




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