Archived posting to the Leica Users Group, 2002/02/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Henry: >Still, how does the strobing >prevent the overlapping of exposure between the >curtain travelling across and the flash. If you're using fluorescent lighting, how does the light prevent the overlapping of exposure between the curtain traveling and the fluorescent? It doesn't. Just as the light from one flash is decaying, it fires again. An almost steady stream of light. Rather than sync the firing of the flash to the precise instant the entire frame is open, it fires the flash all the time. It's not like the flash fires "double" and has an over exposure. It's constantly firing to make a steady light source. That's why it can't do auto or TTL. The flash can't cut itself short...or the exposure wouldn't be even across the image. It also cuts down on the effective guide number of the flash. Takes more energy to continue to cycle the flash like that. Less overall light. Eric - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html