Hi, I’m having a hard time with material I gathered. Last night I took pictures of Rosette Nebula (NGC 2238), around 4h of data with the Canon DSLR EOS 7000D unmodified. While imaging, I was fairly sure that this amount of data will be sufficient to minimize noise. Temperatures were also on the low side - ranging from -2 down to -12 degrees Celcius. All of that and… it’s still painfully noisy, which is especially visible in starless image.
Underneath I’ve pasted a link to my images. Not a stack but all separate, light frames. Try your best, see what you can do with it and please help me answer some questions - am I doing someting wrong doing imaging? Am I doing something wrong in postproduction? Or is it high time to change the ‘ol DLSR for a dedicated astronomy camera.
https://mega.nz/file/mt4yiA5Y#eBxOjUB5URK1ZXr0Cpq7iYx3yoGmdR7W9Ix81Y0dFZs → All light frames (both CR2 and converted FITS)
https://mega.nz/file/zxInBArZ#qpu3miPif-id3FlYxecDw02sZywVakVuR9pxX4NM7JI → 60 mb PNG of best I could do. I’m aware of the blimp/ artifact.
Notice how the noise shows a fine vertical lines, that’s walking noise. It’s what happens if you don’t dither. The only way to eliminate it without dithering is to have perfect PA so that any image movement frame to frame is random. Obviously, dithering is a lot easier.