Looking very nice Steve
Perhaps the 3 channel fits files wouldnt stack because they were RGB, converting to mono 1st might work. How did the G and B channels look, was there any signal there at all?, would be interesting if there was. If not, then extracting red only is obvious anyway.
OIII is smack in the middle of the green/blue filter crossover zone on a DSLR (ie poor response, depending on the curve steepness and gap between green and blue), would be interesting to see how that goes too.
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