CC's meter button only triggers CSR plus, CSRB plus, and CSXCV modules set to the same freq and channel. Any light source that is illuminating at the same time will add to the meter reading. That includes ambient, constant, slaved, and direct trigger light sources. Any continuous light source (hot lights, sunlight, etc) would not need a reciver, as they are not actually being triggered. Any flash source would need at least one reciver to trigger the light at the right time, and all other flashes can slave.
If not using a plus reciever, then Cyber Commander would not be reccommended for use as a flash meter. A polaris or Sekonic 338(?) Would provide similar results in mtering function, but be more tuned to that specific use. Meters like a Sekonic 358 would provide more function like ambient to flash ratio.
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