Having used mine for many thousands of shots at weddings and events, I can't say that I have ever noticed what you describe. The P-TTL can get fooled at times based on what is in the scene - highly reflective objects or large areas of very dark or very light can cause exposure problems - but I don't fault the flash for that.
How did you happen to notice this behavior? -- Best regards, Bruce Friday, July 10, 2009, 5:08:44 AM, you wrote: A> Gang, A> My AF540-FTZ has a quirk which I wonder if you guys could help me A> consider for warranty claim. I'm pretty sure this can't be right... A> The flash has various zoom settings, from 16mm to 58mm. When the flash A> is zoomed to 48mm it gives 1.5-2 stops more light than at other zoom A> settings. The TTL seems to work because I get consistent histograms A> for all apertures on the lens, but the exposure is just two stops A> brighter. Quite often this leads to blown highlights. I have tested it A> with various lenses, and the behaviour is consistent. A> I would have expected some variation as the flash zooms in and out, A> but I can't figure any rational reason for why it should provide more A> output at 48mm than the other zoom settings... A> It _is_ a bit weird, isn't it? A> Jostein -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
