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still sorting out the distance on the field flattener as the edges are still warped but its getting better
Chris What scope are you using and does your field flattener also change the focal length? Looking at your image I do see some minor distortion in the extreme corners, mostly on the right side. The left side is almost perfect, well to my eye anyway. This may be a collimation issue or the camera isn't perfectly square to the optical patch. Some QHY cameras have that issue and there's an adaptor you can get to tilt the camera back. The QHY12 has been a real problem, or so I understand.
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