Using aflashgunto illuminate a line of white disks, they were able to generate intense afterimages in dark-adapted observers.
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The 100/104 designation refers to the type of flash: models ending in 0 had a built-inflashgun, while those ending in 4 used flashcubes.
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Observers were required to verbally report how many disks had been presented, both at 10 s and at 60 s after theflashgunexposure.
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About a year later, a threaded hole was added at the right-hand front above the flashbulb synchronising contacts for securing theflashgunto the camera (version 4).
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An external electronicflashgunwas also available.
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