Trying to diagnose the double limb issue, I focused on what may be incurring the error. Visually when in focus, the double limb can be seen.
Adjusting the tilt doesn't seem to have any meaningful change. Either of the etalons, did very little to change the limb issue. I will try without the 2X barlow to see if it is incurring errors.
Here are different limb locations. The "left side is always better in terms of the limb issue.
Coronado Solarmax 2 60mm DS
right side with limb issue
Edited by wargrafix, 04 May 2021 - 10:47 AM.