I've never heard of a limit on the number of lights in a group, either, and it doesn't really make sense, given that you are talking about a broadcast
light signal. In fact,
the EOS flash bible says:
Quote:
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There is no coded limit to the number of slave flash units which can be in each group. This is because there is no two-way communication between master and slave units - each slave simply sits there and awaits commands, and the master only knows what slave units exist in terms of whatever light they produce during the prefire stage. So you can set up as many slave units as your space and budget can accommodate. The only issue here is the SE (save energy) feature, which will cause slave units to switch to an energy-saver mode after a certain period of time. (see the SE section for details)
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