Nice catch! The number of units in a group is not relevant.
I missed the work "not" in the first sentence when I was interrupted with a phone call.
Omission corrected above.
Agreed, if every lens used with "matrix CLS" provided distance data and enough sensors are used for CLS, a somewhat more intelligent version may appear. This still leaves the reflectance issue to deal with.
Perhaps if the shutter were up while the preflash sequence occurs, and we had sufficient processing horsepower to fire all three groups, look for distance data, identify overlapping hot spots, etc., across the sensor itself, and figure out which group(s) are involved, we could greatly improve things. I still don't see an easy way around the reflectivity issue.
From another perspective, if the on-camera CLS system received data from the remote units (e.g., model, zoom setting, head position, distance from subject, azimuth setting for camera and speedlights, etc.) things could get really interesting. As it is now, I suspect that the on-camera logic simply sees a burst of light from each configured group as you suggested.
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