This is already a stretched image. Do you have the linear version—the one that was stacked with no further processing? Judging by the file size, you also saved it in 16-bit.
Here's what I got from the 16-bit version: https://cloud.mail.ru/public/upUn/45zed5XZw
But from the series, nothing came out—it feels like it was shot without a filter at all. Even with maximum stretching, only a bit of red is visible.
Could the files have been mixed up?
It seems not. Is the squid more noticeable in your version than in the processed one?
Uploaded a new version of the 32-bit stack with 38 hours of exposure. https://cloud.mail.ru/public/Jy8k/afwHeEJHP
PixInsight, PS
I'll try to process this version when I have time, and I also want to point out the focus. I measured the files you sent me, and it turns out the sharpness is twice as low as in mine, even though our setups are the same.
Already more interesting, what gain are you shooting with? I saw somewhere that you set it to 300.
And is the focusing done manually or with an electronic focuser?
My computer wouldn't even be enough to stack 38 hours.
Yes, I alternate. One night at gain 300, the next at 100. Focusing manually using Asiair tools, with constant checking. FWHM is usually around 1.85. I aim for better values. The atmosphere allowed a maximum of 1.60 at best, but then it drifts back to around 1.80.
You're mistaken about that. At 300 gain, your dynamic range drops to about 10.5, while at 100 it's nearly 14—a difference of almost 2 stops. That's why your stars turn into colorless blobs. Try stacking what you shot at gain 100, then with the same reference frames at gain 300, and you'll see the difference. If I were you, I'd shoot at 600-second exposures with gain 100. My FWHM usually hovers around 1.50; when it's 1.7, you can tell it's not sharp.
And there's also trouble with the dithering, the noise is creeping in. I would increase the dither offset and do it every 3 frames (but here I don't know how often you do it).
Comments
But there's a feeling that more could be drawn from this material.
If you can share the sum, it would be interesting to try.
But from the series, nothing came out—it feels like it was shot without a filter at all. Even with maximum stretching, only a bit of red is visible.
Could the files have been mixed up?
Uploaded a new version of the 32-bit stack with 38 hours of exposure. https://cloud.mail.ru/public/Jy8k/afwHeEJHP
I'll try to process this version when I have time, and I also want to point out the focus. I measured the files you sent me, and it turns out the sharpness is twice as low as in mine, even though our setups are the same.
https://cloud.mail.ru/public/uSUc/q141aaTAE
And is the focusing done manually or with an electronic focuser?
My computer wouldn't even be enough to stack 38 hours.
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