Fine Tuning The ASI 6200M Tilt Plate

jerryyyyy

Spending a lot of time getting my field flat so thought I would cross-post some unformation about precision adjustments:

https://www.astrobin.com/uge2ex/D/

wvreeven

Thanks for writing down your thoughts on this. What do CPZ and CFZ stand for?

jerryyyyy

CFZ=Critical Focus Zone=F times F times 2.2... in microns... this is very thin and you need to get the camera to focus in here...

This is the latest iteration of the camera using CCDInspector

wvreeven

Thanks. That looks really well tilted! I'll need to try to get there as well with my ASI6200MM and RedCat 71.

jerryyyyy

It is slowly improving. I have a few manipulations to do but the errors vary with the star fields used... when I make good progress will post to Astrobin as I have some friends helping there.

wvreeven

Keep on posting here as well please. I'd be interested to see your progress.

jerryyyyy

FYI,

This is at backfocus 93.95

https://www.astrobin.com/x0wz5v/

And this is at 94.00

https://www.astrobin.com/n8yyta/

With a picture of the spacer in action.

If I had a reliable way to measure FWHM I could get closer but I think I need a bench set up. The CCDInspector images all look the same after a while and you have to look at the pictures. Would look at the second one fully blow up.

I am going to try to cautiously approach 93.90.

jerryyyyy

The final backfocus was as advertised but tilt had to be remove using NINA Beta 2.0. Tilt now < 10 +/- microns... hope it lasts. Details:
https://www.astrobin.com/k0csk1/B/