Hello, I am using a new 2600 Duo Pro with an Astrophysics 130 EDF refractor, and I have a strange problem in that my flat frames show that the center of the image circle appears to be offset left (or right) by about 5% or so. See the attached contour plot that shows the asymmetry.
I have verified that the OTA image train is straight and unobstructed, and when I attach a different camera (e.g.. Canon 5D4) the image circle is properly centered. So I don't think the telescope is causing the shift.
Could my 2600 Duo have an off-center sensor? Or perhaps the tilt plate is not centered over the sensor properly? Has anyone seen something like this? Of note, according to ASTAP tools, I have negligible tilt in my images.
Thank you for any advice!
--david
