Hi all,
Last night it got really cold (8C !) so I took advantage of good astro weather and added RGB data. Unfortunately, for a strange reason, got only 15 minutes of usable blue as the rest of the subs were shifted by about 1500 pixels so I discarded them.
A crop:
https://www.astrobin.com/full/346610/0/
Full frame:
https://www.astrobin.com/full/346610/B/
I have confirmed what I was suspecting for some time - my 3.2" FTF has some flex so I will need to look into rectifying that.
Thank you for looking!
Suavi