On Mon, 27 Jan 2003 11:38:12 -0500, Joe Wilensky wrote: >But what happens if you use the AF-280T in conjunction with the RTF, >which is the only flash I have with bounce/swivel capability? It >doesn't support contrast-control shots. But if you fire the AF-280T >(let's say angled toward the ceiling) and the RTF flash together, you >still get TTL flash, but what's the effective ratio -- just the >difference in guide numbers? > >I assume the TTL would shut off both flashes at the same time, but >perhaps the more powerful one would therefore dictate the overall >exposure? Would this be workable for bounce flash with a little >fill-in flash via the RTF? Or should I get an AF400FTZ or AF500FTZ >and stop worrying about this question?
Joe, I haven't done this with the 280 but have done it with a number of other flashes. Depending on the height and colour of the ceiling you will lose 2 to 3 stops from the bounced flash (assume 2 for a normal height white ceiling). This should mean that you end up with still about 1.5 to 2 times the light reaching the subject from the bounced flash than from the RTF (depending on the output of the RTF, but I'm being rough in my estimates here). It should look good enough. The best way to tell for sure is to do some test shots. Just find someone pretty, tell them you need to see if something works, line them up and shoot them. Leon http://www.bluering.org.au http://www.bluering.org.au/leon
