Archived posting to the Leica Users Group, 2002/01/14
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Tim Atherton wrote: > > ----- Original Message ----- > From: "Rolfe Tessem" <rolfe@ldp.com> > To: <leica-users@mejac.palo-alto.ca.us> > Sent: Monday, January 14, 2002 12:33 PM > Subject: Re: [Leica] Re: NEW M7 MAJOR CROCK-POT CROW PARMESAN > > > Tim Atherton wrote: > > > > > > > > > > > As far as I know, and I'm pretty sure about this, as I've described it > > > > above is how all the systems you mention work. Which is why I said > that > > Your are the second person to mention this and I stand corrected. I > > would be interested to know.the details of how it does this given the > > limitations inherent in having only one behind the lens sensor. > > > > I have seen systems that claim to do as you describe, but on closer > > examination they all were dependent on the positioning of the flash > > units themselves to regulate the lighting ratio. > > > > > > Rolfe > > http://www.ikelite.com/web_pages/lite_link.html > > The way I believe it works is simple. The main on camera (or attatched by a > TTL cord) flash triggers the second, wireless flash mounted in an ikelite > lite-link (including multiples) like a normal slave. The on camera flash, > once it has detected the correct exposure cuts itself off (which, of course, > includes the total of the light from the other flashes). At this point, the > Ikelite lite-link acts like a slave in reverse. It detects the flash falloff > from the main flash, and cuts off it's own flash - et vola. Correct ttl > exposure. Correct TTL exposure, yes. That's not so hard. The question is, can it do a 2:1 or 3:1 ratio and, from what I glean from the link you posted, I don't think so. I think you have to use the positioning of the units to establish the desired lighting ratio which is really a step back about 30 years. - -- Rolfe Tessem | Lucky Duck Productions, Inc. rolfe@ldp.com | 96 Morton Street (212) 463-0029 | New York, NY 10014 - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html