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Don from Astrodon is a smart fella. Ken Crawford has shown what the Astrodon Red Continuum filter is really for. To isolate very dim nebulousity without the associated bright stars so image processing is far more straightforward.
Software elimination of stars is all well and good to give an idea of what is possible.
Ken has shown that the surgical precision of subtracting stars with the continuum filter is the way to really image all the very dim nebular stuff.
Wonderful image Ken.
Bert
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