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Focus issues
I found that I had a similar problem with an edge 14 Focus that was not even throughout the focal plane. It had a moonlite focuser attached. I compared this with a standard baader visual back by comparing both with a laser on a centered secondary target. The secondary was removed for this. Both landed on different spots that were not in the centre of the secondary. Puzzled with this I removed the corrector plate retaining ring and discovered that the corrector was not centered. I centered the corrector plate by aiming the laser at the secondary centre target with the baader visual back insitue This solved my problem.
To sum up, the corrector plate was not in the optical axis of the visual back.
John
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