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Hi Bob, your image seems to be exhibiting field curvature. I had good sucess with a WO PFlat2 but I had to experiment quite a bit to get it positioned correctly. The distance from CCD to flattener is critical. You also must be aware that this is also a 0.8 reducer so will open up your field of view and make your targets a bit smaller. By the way the PFlat2 was designed for use with an APS size chip which is what is in the QHY8 and DSLR's.
Nice image appart from this.
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