Hi,
Up to recently, I had an dobson mount and could only use 0,25/0,5s shots.
Since I bought an equatorial mount, I'm playing with longer exposure times such as 8s/15s.
That revealed a blue line in my pictures.
The blue line always comes from the top right corner of the picture, no matter how I turn the camera on the telescope.
I even took pictures without the telescope (Sky-watcher 150p Heritage) or any accessory (focal reducer 0,5x, helicoidal focuser)... so it doesn't seem to come from a light leak.
Darks don't help to remove the blue line.
Do you have any advice to help me finding the source of the problem ?
Have you heard of a similar problem ?
