No one has mentioned using 2 separate filters - something like the Antila Edge at 4.5nm in Oiii and Ha - I know that it is not efficient using a OSC with single narrowbands, but wouldn't that be much more advantageous particularly for an acromat where you're only dealing with one wavelength at a time? Someone on FB posted their Ha and Oiii images recently which I downloaded to have a play with combining in photoshop elements and I found the results very pleasing - particularly having control over the different colors (PS elements doesn't have individual channels available).
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