sorry for 3rd post. This one is ‘interesting’. In my last post I described my exposure run of NGC281 pacman neb. The mount went to the west side and all went fine for 20 mins until the mount hit the west limit. However, the 4x 5 minutes exposures which were downloaded were reversed left to right and also up/ down.
I found this out when I tried to align and combine the images in Nebulosity 3. It’s the right area of sky no doubt, but the images are reversed both ways. Nebulosity facilitates left right flip and up down flip, so I did that and thought it would be fine. I inspected the images and they seemed to be the same as the remainder of the Reds (I took 4 on West side of mount and 9 on east when I restarted a bit later).
When I aligned them and stretched it was a real mess - difficult to describe, but made you feel dizzy to look at it!!!.
So I scrapped the 4 exposures and used the other 9. I have never seen this or anything like it before. Any ideas? I’m stuck - there were no setting changes at all - everything the same.
It’s an sBIg stt8300 cam with SG filter wheel.
I just hope it doesn’t happen again as obviously it has taken up precious imaging time. Here in the U.K. , I get so few cloudless nights I was out imaging NGC281 on Christmas night…
thanks for any thoughts,