Battery–capacitor flash
{{Short description|Type of photographic flash system}}
Image:Polaroid bc flash model 281 IMGP1842 WP.jpg
A battery–capacitor flash (BC flash) is a flash photography system used with flashbulbs. Instead of relying directly on the current pulse ability of a photoflash battery to directly fire a flashbulb, a battery is used to charge a capacitor that is then discharged through the flashbulb. BC flash units use 5.6 V, 15 V, or 22½ V batteries.
Advantages
A special high-current photoflash battery is not needed, and even an ageing battery can charge the capacitor, although recycling more slowly than a fresh one;{{Citation|title=Nikon Flash Unit BC-7 Instruction Manual|url=http://camaracoleccion.es/BC7_Manual.pdf}} the charged capacitor delivers a high-current pulse and reliably fires the bulb.
References
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- Electronics for Photographers, by Marshall Lincoln, Copyright 1966 by Chilton Books, pp 43–54.
- [http://physics.bu.edu/~duffy/PY106/Capacitors.html Capacitors & Batteries], Boston University Physics Department
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Category:Photographic lighting
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