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I’m well aware of the Dragonfly array (they use SBIG cameras after all  ) but the system’s magnitude limit has been slowly increased by effectively *increasing its aperture* (by adding additional lenses to the array) while keeping its f-ratio constant.
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I think this is not quite the case - by addiing lenses, they are essentially adding the frames to the stack.
The only thing saved here is time (but not money, considering the price of Canon 400mm f/2.8 lens)