Not sure what you mean by "light modifiers" and how they would be any different when using something that reads a P-TTL pre-flash and something that reads the flash at exposure time.
I've had several dedicated TTL flash systems in the past. They had an advantage when doing macro work or using filters as I had to do less thinking about how to apply compensation for the light loss. But only up to a point ... and that was with film. With digital preview, any such situation is easily evaluated without even making an exposure. I suspect that digital preview would have been a wonder when I was using film SLRs... instant exposure feedback!!! for nothing!!! That's what we used to waste hundreds of dollars on with polaroids ... :-) Godfrey On Mar 5, 2007, at 8:56 AM, Bruce Dayton wrote: > My experience is somewhat similar, even though I do quite a bit of > flash photography at weddings and events. If I am just doing daylight > fill, then the AF360FGZ or AF540FGZ work very well as they can be > dialed for compensation and support hi speed synch. Basically just > dial in the amount of fill you want on the flash and start shooting > just as if the flash wasn't there. > > When the flash is the primary light source, things change quite a bit. > TTL or P-TTL on my *istD were fairly inconsistent. Not that I > couldn't get a usable image, but that I couldn't get consistent > exposure - usually underexposed. Since getting the K10D, I have shot > two weddings using the AF400T in auto mode and have gotten a much > better exposure overall and fairly consistent. I do kind of wonder > how well the AF540FGZ would do in comparison. > > There is one benefit to the TTL method, although I don't know how well > the P-TTL would actually work - that is when using light modifiers - > especially strong ones - the theory is that the light hitting the > sensor is measured for the exposure. But some of the light modifiers > can eat up 2-3 stops of light. Since the P-TTL is a quicker, weaker > flash, I could see how it might get misread. Can't say that I have > really experimented enough to know but I could see some problems. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
