Based on the screenshot, scope focal length is wrong: your input was 300, but the blind solver detected 2000!. So, what's the real focal length of your scope? One thing you must consider it that plate solve is normally "not blind", i.e. the solver is fed with approximate pointing data to speed-up the solve. Moreover, solving success it strongly related to the selection of correct index file, which, in turn, is related to FOV and so to sensor size and scope focal length. If this data is not correct, solver will fail.

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