Causes of field curvature in an ag optical idk telescope
Posted 29 September 2022 - 09:34 PM
Shouldn’t be this hard but as luck would have it it is for me lol
Here what I’ve done so far
Collimation using sky wave ( comes out perfect every time)
Dave has had the scope back and gave it the okay nothing wrong with it
Ron at moonlite checked nitecrawler focuser and it was dead on
I do have some focuser tilt as the laser doesn’t hit the center spot without tilting
I have tried collimating with and without tilting the focuser to no avail
Tilt adjustments using ccdi and hocus focus
No matter what I do I still end up with elongated stars in all different directions
Top left - major axis pointing center
Bottom left - flat stars minor axis pointing towards center
Top right - major axis center
Bottom left minor axis center
There is no pattern to it at all nothing that says backfocus is wrong or anything
Tilt in ccdi when I get it to 0 still shows 30% curvature and I still have elongated stars in corners
What in that holy crap could be wrong!!!???
Any ideas please , pretty please!! Would make my life so much better haha I feel so defeated and it’s been 2 months and so many clear nights gone
I have to get this!!!
Posted 29 September 2022 - 10:16 PM
I don’t have an iDK, but I would ask what your exact image train is.
Focuser (Nightcrawler) followed by OAG (model?) followed by filter wheel (model?) followed by camera (model?) or something else?
My guess would a combination of tilt and backfocus. Can you add and/or subtract a millimeter from the backfocus to see what happens to the star shapes?
Hopefully someone with a similar scope and image train can chime in.
Posted 29 September 2022 - 10:33 PM
I’ve also tried removing all of that and just using the camera and got the same results
The corrector is integrated into the scope so back focus is felt with by moving the mirrors closer or further apart a little
AGO has the back focus at 10.45” and mine is at 10.25
Dave at ag optical says if it’s within + or - 25 I’m good to go
I still suspect some of the issue is back focus but my stars look horrible off axis out of focus
I’m literally at the point where either I pay someone to look at it or sell it lol
Posted 29 September 2022 - 10:37 PM
Posted 30 September 2022 - 09:22 AM
Posted 30 September 2022 - 11:57 AM
Posted 30 September 2022 - 06:46 PM
Ron from moonlite gave me his focuser tilt plate and camera plane adjuster and I’ve tried it but ran out of adjustment on the camera plane one