GraemeH Posted January 21 Share Posted January 21 Scope: Skywatcher Evostar 72ED Mount: Skywatcher HEQ5 Pro Camera: QHY294M Pro Wheel: QHYCFW3 Flattener: OVL Field Flattener Filters: Antlia EDGE 4.5nm SHO, Antlia V Series LRGB Guide scope: Skywatcher 9x50 finder Guide camera: ASI178C Captured over 4 nights, this image has 45 x 300" Ha, 37 x 300" OIII, 36 x 300" SII, 32 x 30" R, 33 x 30" G & 30 x 30" B, all with the camera at -10°C. Calibrated only with darks, because for reasons I can't quite understand I don't seem to be able to get good flats with this new camera and filters. Never had a problem with flats when I was still using my DSLR. SharpCap used for polar alignment. PHD2 for guiding and EQMOD for scope control. APT for capturing. APP for stacking and initial processing. Starnet++ V2 to create starless narrowband masters for combining into a colour image in Photoshop, and RGB stars added on top. Thanks for looking, and comments welcome. 6 Link to comment Share on other sites More sharing options...
teoria_del_big_bang Posted January 21 Share Posted January 21 Vey nice image, love the colours. What's the issue with the flats ? Maybe somebody with a similar setup can help here ? Steve Link to comment Share on other sites More sharing options...
Elp Posted January 21 Share Posted January 21 That's a great image. The 294 sensor is notorious for generating uneven flats, it was touched upon in this thread (as well as many others on the internet): Link to comment Share on other sites More sharing options...
GraemeH Posted January 21 Author Share Posted January 21 1 hour ago, Elp said: That's a great image. The 294 sensor is notorious for generating uneven flats, it was touched upon in this thread (as well as many others on the internet): Thank you. I had a read through that thread, but I don't think it's the same issue that I'm seeing. My flats show a much stronger vignette than my lights, and when I use them for calibration my calibrated lights look like the vignette is increased instead of reduced. I don't understand what's happening, but will continue trying to take flats that work. I don't disassemble my kit at all, so hopefully if I do find a way to take better flats I'll be able to reprocess my image with them included. Link to comment Share on other sites More sharing options...
GraemeH Posted January 22 Author Share Posted January 22 Been reprocessing this image a few times today because I thought I'd overdone it a bit with the colours in the previous version. Appreciate any comments on whether this new version is better. 1 Link to comment Share on other sites More sharing options...
teoria_del_big_bang Posted January 22 Share Posted January 22 Great image and I love the subtle colours 🙂 Steve 1 Link to comment Share on other sites More sharing options...
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