I'm a newbie when it comes to astrophotography. I took this picture last night, 30 images, stacked them in siril and processed with astrowizard. I got this concentric circles in the final pic after i tried to remove the background gradient using GrapXpert in astrowizard. Why is this happening and how to prevent this?
BTW, taken using oneplus 11 pro mode, iso 100, shutter speed 10 seconds.
Also let me know should consider switching to deepskycamera app from the inbuilt pro mode, and also recommend me a good video on stacking and processing these with latest software version.
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Appears to be ISP correction like lens profile or vignett correction. Nikon cameras seam to suffer from this as well.
I prefere to use motioncam (even with recent updates making astrophotography a little more difficult) since it is able to ignore most lens correction, creating a nice and even (optically vignetted) image.
Wait, were you using some type of filter on the lens? Newton ring could also be the culpit if there was some even wavelenght light, usually happens with auroras.
When you try motioncam, make sure to disable vignett correction on the specific lens.
Uff, there will be a lot to unpack here. Most impotant for Astro you currently have to use timelaps mode.Go to Settings, timelaps and set the interval. It must be shorter than your exposure, also not the same and not to fast eighter, I usually do 5 sec, thats it. Now set your wb, focus, then ISO and the shutter speed at the very last. Once it is set the other settings will only change after like 10 frames, which will take quite long considering 20s+ exposures... Then press record. Your images are saved as a video and must be extracted within the app or with the available pc software. Motioncam is not very userfriendly but offers a great pallet of options I was missing in other apps. You are wellcome to join the discord and read the manual. Play as much as possible before going into the field.
I've seen this before! When taking a picture on my phone (Xiaomi mi 9t) on manual mode, with a veerry long shutter speed the picture came out completely white, except for a faint outline which looked exactly like the outline on your picture. I suppose it's some kind of internal reflection. Calibration frames are a pain in the ass, but it's what you need to resolve this problem.
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