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You can use them in any flash unit they fit into. The only important point is that to use them with a short duration focal plane shutter, the camera must have the correct sync timing (M sync). Two things cooperate in this action:
1) the shutter slit opens and starts to travel after a short delay to allow the bulb to reach full brightness
2) the FP bulb maintains full brightness for a longer time than a regular bulb, allowing time for the shutter slit to travel across the whole image
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Old TV literature, New York World's Fair, and other miscellany
Last edited by old_tv_nut; 10-07-2017 at 09:27 AM.
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