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M57 (Ring)

still sorting out the distance on the field flattener as the edges are still warped but its getting better

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Comment by Chris Elliott on April 29, 2017 at 7:39pm
It is a William optics 80mm zenithstar apochromatic refractor with the field flattener and 0.8 focal reducer which I'm still trying to perfect...and I did crop it a little bit to cut some of it off as I am oh socose at getting it perfect...but it's really coming along
Comment by Russ Ruggles on April 21, 2017 at 5:34am

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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