I've seen this on the forums many times and I've read through the threads.. seems like people are shooting in a TRIANGLE kind of a format where two corners of the triangle are strobe lights and the one corner is you with an on camera flash for fill.
Couple of questions I have (i know these are very subjective) and would greatly appreciate it if someone can help me with these.
1. Ive read "point strobes at the dance floor and take a meter reading"... what kind of reading do you go for? Like is it trial and error? or do you simply go for a certain camera setting for example 1/125, f/2.8, ISO 400?
For example if you do measure the strobes for that meter reading and your meter states that now the dance floor is correctly exposed (by only those 2 strobes)..
2. How much power do you use on your on camera speedlite for fill then? or do you put it in ETTL and let the speedlite decide on how much power to put out? Can the speedlite correctly decide this when its in ETTL mode while the other two strobes are in manual?
3. Is the speedlite pointed at the roof for bounce?.. or is it pointed straight at the subjects with some kind of diffuser on the speedlite?
FYI the strobes are Einstein 640W's