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Sharing with you my finished image of the Swan nebula imaged through SII, HII and OIII narrowband filter using my modded and cooled Canon 40D. Imagd trough my C8" SCT at 2032mm focal length.
Total exposure was 27 hours across multiple nights.
This is a work in progress, I'm spending my clear moonless nights capturing narrowband data of M17, at 2032mm focal length through my 8" SCT, using my Cooled and modded 40D.
I still have SII to capture to complete the project but for now I played with the data I already have.
As it turns out that both the HAlpha and OIII subs have a considerable amount of blue data in them, separated due to the DSLR being a OSC camera, so I used the red out of the HAlpha image, green from OIII green channel and added the blue from HAlpha (the Hbeta data) and blue from the OIII stack and used it as the blue channel, resulting in a almost natural color pseudo RGB image, attached.
Once I have the SII data, I'll assemble the channels into a SHO narrowband image of M17.