My question is regarding flashes. I have four flashes, but three different models. I have a Canon 430EX II, and old Canon 540EZ and two new YN-560 III's. I have triggers for everything and they all work well with my camera. But, I wonder if you have any experience with white balance issues when using different flashes in the same shot?
The answer, I think, depends on how nit picky you want to get. Sure the WB between different flash brands is probably slightly different with different. Technically, WB will also vary with the flash power level too, but I never noticed that. I doubt that any WB differences between flash brands will be a big problem for real estate photography. You could always do a flash test against a white wall to see if you can see any noticeable WB variation between your flashes.
I have a 580-EX and a bunch of YN-560-III, but I've never used the 580-EX with YN-560s mainly because they take different triggers. So I've never experienced any differences between flashes.
Has anyone experienced WB variations in different brands of small flashes?
Update 12/16/2014: Thanks to Jeff for doing a test to demonstrate! Click on the image for this post above to see Jeff's test described below in the comments.
Update 12/17/2014: Scott Hargis made an comment that is important enough to highlight it here: "This is a non-issue unless you’re pointing your flash(es) directly into the room at high power (in which case you have much bigger problems than color). With anything resembling good technique, the flash is picking up more color from the walls, ceiling, umbrella, reflector, and every other object nearby than anything else."