Quote:
Originally Posted by mithrandir
Stacked filters should subtract. eg, Astrodon Gen 2 Blue+Green (both E and I series) should only allow about 490 to 510nm There is no overlap in the bandpass with their Green and Red filters.
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Of course and that's what I want. So if I stack the Green + Blue I will get the area common to both in the transmission chart. I don't know what I was thinking. Cool. I'll do that next time. Oiii turned out to be way too narrow after all.