I want to check the tilt of my ASI071MC Pro for the first time. I have CCDInspector, which I have used to inspect old images. I has some nice displays that show tilt and curvature very clearly.
I think it makes sense to use my Orion ED80DT CF refractor with a Moonlite focuser and the Orion Flattener for Small Refractors. I don't want to confuse the issue with possible collimation errors with my other scope which is an EdgeHD 8. Does that make sense?
Any tips on what to do?
My plan is:
- find a FOV with lots of stars out to the corners
- take a few shots, look at them with CCDInspector, to see it there is tilt and it appears consistently in all the images
- rotate the camera (not the whole focuser) 90°, take another shot, and see if the tilt moved with the camera
If the tilt rotates with the camera, I will assume the tilt is in the camera. Then play with the tilt screws to reduce the tilt, then rotate again and see if the tilt is very minimal in all positions.
If the tilt doesn't rotate, I guess it is somewhere else in the image train. The Moonlite can rotate, I guess I could rotate the Moonlite and the camera together, and see if the tilt shows up there.
Should I rotate 90° or 180° between shots? Or maybe 90, 180, and 270 and back to 0 to really scope out the situation. (No pun intended!)
Comments? Advice? Thanks in advance.
Pics below show CCDI curvature and 3D plot BEFORE I worked on my camera.
Backstory: While reassembling my ASI071MC Pro after drying the desiccant, I realized I didn't mark the orientation of the tilt adjuster at the front of the camera. I did mark the orientation of the red part with the AR window, although its orientation is obvious because of the pins for the window heater. So I said some four letter word, probably "darn". So anyway, I have a 1/3 chance of getting the tilt adjuster on the right way. I will assume the tilt was quite accurate coming from the factory.
Edited by t-ara-fan, 19 July 2019 - 06:41 PM.