Thanks guys.
Thanks Carl. As there is no obvious answer here are the details.
New image - over saturated and cropped the centre section to illustrate the problem, which is image wide, depending on star density near the corners.
Camera 1000D - noise reduction both off - not cooled.
Lens 200mm prime f/3.2 - CLS-CCD filter.
ISO 800
Ambient temperature ~10 C.
Polar scope alignment - 15 minutes no appreciable drift.
38 frames: 1x 15, 2x 10, 2x 7, 31x 5, 2x 3 minutes - 3.5 hours
I use PixInsight for the heavy lifting. So there are technical differences in relation to calibration of lights darks and flats - please take it up with the PI developers. I wont take up space explaining it here. I suggest reading their explanation rather than debating it here.
Problem is the same with and without calibration.
40 bias frames - 10 darks and 10 flats.
So what is causing the streaking?
Quote:
Hey Rowland,
Been a while - hope you're well
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Ivo. I've been good just busy how are things with you? I'll be sure to download the latest ST.