I'm at the foot of the low mountain range Egge mountains. So the air is troubled when passing by. Most of the time the wind is alongside the mountains and not crossing the range.
Downloading your data. Going to process them later, now that the sun is out I want to spend some time in the pool if it is not too cold.
I tried Wikipedia, it says "Lower Saxon Hills." Wow, that sounds very historic (at least to an American lol).
However, in the picture I can't say I saw anything that looked like much of a hill.
Actually I do not drink any beer. Have a nice Italian red wine instead. I have a swimming tray for the pool with little pockets to put glasses in....
Back to the topic. Here is my go on Freddy's data.
Processed to 4k, downsampled for the upload:
100% crop of the center:
actually I find this better than my own data. It shows less stars but also less artifacts. Nice data!
I think we will need one of your famous side-by-side's, Elf. Though I would imagine you are again being too self-critical of your own data, I'm curious what the artifacts are that you speak of. Maybe a zoom with some arrows?
I'm also wondering about resolving when it comes to these RC's vs. refractors, though Freddy does have a decent aperture at 130.
The star halos have a particular color pattern to them, almost like prismatic dispersion. I have been getting quite a bit of that myself lately. I expect it low on the horizon, like with Omega Centauri, but I'm going to have to do a test to see if it follows my objective lens orientation to rule out an optical problem. That said mine are generally half and half as to blue and red edges. Freddy's data looks more like 3/4.
RGB align in the stacker helps fix most of it on my data.