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Another question about streaks in images [Deep Sky] Acquisition techniques · Keith R. · ... · 4 · 101 · 1

ankaa 0.00
Keith R.
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Hello.  I see a lot of posts asking "What causes this?" but none seem to be exactly what I am experiencing.
The following image is a simple stretch on my master light stack before any post-processing.  This was stacked in PI using WBPP script.  I have lights, darks, darkflats, flats, and a master bias.  I believe all of the settings were at or close to default.
This was taken through an EDGEHD 8" with an ASI294MC Pro using SharpCap 4.1.
I don't understand where the diagonal streaks are coming from.  I went out 4 other nights to image the same galaxy and there are no streaks in those stacks.
I am really curious to see if anyone has seen this before and can offer an explanation.
Thank you

Question.jpg
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tboyd1802 3.34
Tom Boyd
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First impression is it looks like walking noise. Are you dithering?
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Gondola 8.11
Tony Gondola
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+1 for walking noise.
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andreatax 9.89
andrea tasselli
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Usually this happens either because you have not dithered or you haven't corrected for noise (CosmeticCorrection).
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ankaa 0.00
Keith R.
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Thank you for your responses.  I had forgotten about walking noise.
I did a quick stack of the raw frames with no alignment or anything and the stars streaked in the same direction as the stacked image bands, so I did have a bit of field drift.
I have been having problems getting great polar alignment using SharpCap's PA tool.  One cause of that could be flexure, which could also cause the walking noise.  So I'm off to find out where it can be and start saving up for a new OAG and guide camera.  smile

To answer questions - No, I was not dithering.  Looks like I will need to add that to my sequence once I figure out my drift issues…

Thanks again.
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