Hi Lester,
Yes I use the WO ZS80 to do the autoguiding with a QHY5 camera.
If you have a look at frankbonneville.com in the astro tab, the last pic at the bottom shows a shot of the setup when I first set it up. It's now slightly different in that I have removed the flip mirror that is attached to the WO ZS80 and simply use a couple of extenders instead (the flip was bugging me because i stuggled to get it to perform perfectly so i do without now). Obviously, the diagonal is normally replaced with the 20Da (in fact i virtually never hook it up-i always use the 20Da).
I have also installed a couple of C14 flop-stoppers from Ironwood in case I got some mirror flop issues (i usually wait for a problem to develop before fixing it but this time i took no chance). Seems to work a treat.
So i dont think i'm getting any issue with mirror flop in these 10 min shots.
I'm not sure if your OTA is on forks or a GEM. You might get some field rotation at 10 minutes? if on forks? I have to say i know nothing about forks (and probably not much more about GEM
)
I was looking to see if I could see your setup somewhere but mainly found some of your awesome Jupiter posts I saw one done with a 2x Barlow!!!! Holy Chiwawas! I will definitely try it out at some point with a 3x Barlow)
I want to nail the drift align first to do some shots at F11...then I'll give planetary a shot (my knowledge base there is Ziltch!)
frank