Originally posted by MikePerham The 360 does an excellent job with fill flash and such, but the 540's extra power is useful when using light modifiers. Recently, I have been doing a lot of portrait and wedding shoots and so using these flashes a lot. I have come to the conclusion that Pentax needs to upgrade the flash system. I would love to see them offer the ability to use different ratios on several off camera flash's (as does Nikon) and if they really want to one-up Nikon, offer a radio trigger system that retains P-TTL and the different ratio feature. And improve the build quality too...
Agree with all of the above. I would add that the 540's higher guide number comes in very handy not just when bouncing or using a modifier but also when shooting wedding formals at the altar, where you often have strong backlighting to overcome. I use BOTH 540s in that situation. Output also matters when using flash for fill in bright sunlight. I believe that the Metz model I'm looking at has a higher guide number and some other features that the Pentax 540 lacks:
Amazon.com: Metz MZ 54247P 54MZ-4 Flash for Pentax Cameras: Electronics
This model does NOT support P-TTL, I think, and that may be one of its advantages.
Originally posted by RiceHigh: I would recommend the 360(FGZ), which is the best buy out there and is not ridiculously high priced. Forget about 3rd party flashes, which are either not P-TTL compatible or can be problematic (poor compatibility and even more inaccurate).
I don't have experience with a lot of third-party flash units, but my experience with Pentax hasn't been very good and my problems have been reported by many other users as well. I've heard a lot of good things about Sigma flashes, from folks in this forum that own them; and Metz is the gold standard. I owned the Metz unit above briefly and sent it back for some reason I can't even remember (lack of P-TTL, perhaps) and later regretted sending it back. It seemed really solid. I don't personally see how the Sigma units could be much
worse than the Pentax units, and they certainly are cheaper. The one caveat that I have heard expressed about buying third-party flashes is that you might occasionally have a compatibility problem introduced by a firmware upgrade to the camera. I would personally want to investigate this a bit more before buying a third-party flash, but I gather that, if it is a problem, there's a fix for it.
Many third-party flash units do indeed support P-TTL, if you want it. But P-TTL has some serious problems. I would like to have a chance to try old-fashioned TTL and see if I can't do better with it.
I'll say again: This is simply not a strong point of the Pentax system, and I quite agree with Mike that releasing a couple new, really good flash units would be a tremendous boost for the Pentax line for the people most likely to be interested in it, which are wedding and portrait photographers (like Mike and me and many others on this forum) who find Pentax appealing for other reasons (price, image quality, prime lenses, etc) but who really need good flash support.
Will