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Thank you for your comments Marcus, Mike and Allan.
Marcus, the details. The total time was 7.8 hours. Imaged 15 km from Melbourne CBD, in the red zone according to those light pollution maps. Narrowband imaging is all I can do from here, and gradients are definitely an issue.
6 subs at 20 min 1X1 binning.
10 subs at 35 min 1X1 binning.
Camera: STL-11000m running at -15 / Scope: 10” RC f9 / Mount: AP-900 / Baader Ha Filter 7 nm
Data calibrated and stacked with CCDStack, and processed with Photoshop 6.
Mike, your memory serves you well. I did use an STL-11000 on a 10” RC. I think I have enough data for now unless we magically get some cloud free weather here that allows a total reimaging of the target with another orientation to avoid that bright star. I’m sure you appreciate just how difficult getting a suitable guide star that allows your preferred framing can be at times. That FOV in the guide chip is small.
Terry
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