Got a situation with this photo that I’ve just recently discovered. Link provided below.
https://www.astrobin.com/3r5tkt/B/
what I’ve noticed in zooming in on the photo is all the stars, I’d say 80% of the photo have been aligned, but when you zoom into the center portion of the galaxy the stars are not aligned and the galaxy has a offset blur. Any idea as to why most of my stars were aligned but in the center of the photo they are not. This is a combination of 2 nights worth of data, I did take my setup apart and reconnected for the second nights worth of data. Equipment used was a stock Canon 60D and a sky-watcher 82Ed, 530mm focal length, without the field flattener. I stacked the data in sirilic which if you’re not aware is a front end app for Siril to stack multiple sessions either with OSC or mono. I’ve stacked in it before with no issues. Not exactly sure what’s going on here. I may try DSS and see what it gives me, I’ve just always used Siril for all my stacking needs. Any ideas as to what may have caused this would be greatly appreciated. As I don’t have a clue. I’m looking at doing another session for my M33 galaxy shot and combining that data also, although I have left the camera mounted to the scope to keep the proper rotation angle. For this image I didn’t do that as they were taken about a month apart. Didn’t even find the problem till I was looking at the full res pic here on astrobin to download it to my iPad for wallpaper on my Home Screen. In looking at the shot zoomed in as it were, I started noticing stars in the center portion that seemed to be doubled along with the misalignment blur in the galaxy center, kinda like you’d get when trying to align layers in photoshop. Just no idea what happened here. It would seem to me if the app could align most of the stars surrounding the galaxy why were the stars in the center portion of the photo not aligned. The field, even though may be slightly rotated should have still been able to be matched up. I mean I’m seeing guys doing live astrophotography with alt-az mounts which rotate the field of view and getting great shots. If there had been any field rotation due to my polar alignment error for each session, the app should have still be able to align the shots. That’s not supposed to give you issues. Even different focal lengths aren’t supposed to give you issues. It’s a new one on me.
https://www.astrobin.com/3r5tkt/B/
what I’ve noticed in zooming in on the photo is all the stars, I’d say 80% of the photo have been aligned, but when you zoom into the center portion of the galaxy the stars are not aligned and the galaxy has a offset blur. Any idea as to why most of my stars were aligned but in the center of the photo they are not. This is a combination of 2 nights worth of data, I did take my setup apart and reconnected for the second nights worth of data. Equipment used was a stock Canon 60D and a sky-watcher 82Ed, 530mm focal length, without the field flattener. I stacked the data in sirilic which if you’re not aware is a front end app for Siril to stack multiple sessions either with OSC or mono. I’ve stacked in it before with no issues. Not exactly sure what’s going on here. I may try DSS and see what it gives me, I’ve just always used Siril for all my stacking needs. Any ideas as to what may have caused this would be greatly appreciated. As I don’t have a clue. I’m looking at doing another session for my M33 galaxy shot and combining that data also, although I have left the camera mounted to the scope to keep the proper rotation angle. For this image I didn’t do that as they were taken about a month apart. Didn’t even find the problem till I was looking at the full res pic here on astrobin to download it to my iPad for wallpaper on my Home Screen. In looking at the shot zoomed in as it were, I started noticing stars in the center portion that seemed to be doubled along with the misalignment blur in the galaxy center, kinda like you’d get when trying to align layers in photoshop. Just no idea what happened here. It would seem to me if the app could align most of the stars surrounding the galaxy why were the stars in the center portion of the photo not aligned. The field, even though may be slightly rotated should have still been able to be matched up. I mean I’m seeing guys doing live astrophotography with alt-az mounts which rotate the field of view and getting great shots. If there had been any field rotation due to my polar alignment error for each session, the app should have still be able to align the shots. That’s not supposed to give you issues. Even different focal lengths aren’t supposed to give you issues. It’s a new one on me.
we’ll see what DeepSky stacker gives me. If I get the same result then it may be the files, if not then it could be sirilic.