Go Andre! Thanks for pursuing macro exposure performance with two 360's. I've done wireless macro hand-holding of one 360 at 25cm from the subject and I get perfect exposures.
Thanks also Arnie for sharing your experience. With respect to controlling the 1/1, 1/2, 2/3, 1/3 output ratio between the built-in flash and the off-camera 360 as described by the 360's manual, I do not think it will work between the two off-camera 360's. That is, setting one 360 to 1/3 and the other 360 to 2/3 will not give you a 1/3 - 2/3 ratio between the two off-camera flashes. Both off-camera flashes might be set identically to 1/3 or 2/3 to yield a collective 3 against the built-in flash's 1 or 2, but there is no way for the camera to know that you have two wireless 360's out there(unless I'm mistaken). The two off-camera flashes operate as if only one were there, as far as I can guess. The gist of my question, for anyone else out there who wants to donate 2 cents, is the nature of the exposure information that transfers between the camera body and the off-camera flash in their pre-fire dance. The camera does not know how many 360's model the subject, but apparently, according to Andre and Arnie who have two 360's, the built-in flash sends the correct exposure info to the multiple 360's and they attenuate properly to collectively give what the camera asked for. In any case, I'm going to get a second 360 at this point since it seems to work. I'll be carrying them around with these little tripods http://www.pedcopods.com/up1.htm to set them off camera, since I can't find the off-camera clip CL-10 that Pentax apparently made for the 360. Thanks again, guys.
