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.
Have you tried f5.6 and f4? Probably not and you probably won't as these apertures are not usefull for macro. But my guess is that it will begin to slightly overexpose at f/7 at 25cm. But I need to do more systematic tests with a plain grey card or a grey 3D object to see what are the "limit" distance/aperture setttings.
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.
I tried it with two 360ftz as slaves (Wireless and P-TTL) and the built-in flash as the controller, setting one 360 at 1/3 and the other one at 2/3, and it worked! I scraped my test pictures but can easily reproduce the results.
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.
I tried 1/3 and 2/3. Would it be the same with one at 1/1 and the other one at 1/2? I will be able to make further test only next week.
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
We're following the same path. I tried yesterday two very small and light pods but as their legs are too "flat", the flashes can easily bring the whole thing down. The ultrapods are interesting.
I can't find the off-camera clip CL-10 that Pentax apparently made for the 360.
Hopefully as they must be very expensive...
Andre
