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very interesting as if you look at it if your focuser is tilted enough it will make a big difference, trust me when i say this as i had egg stars on one side of focus and those egg stars rotated 90 degrees on the other side of focus, and i had 3 senior members of ASWA looking at my scope, with a Astrosystems Barlow/laser Autocollminator, and Cheshire ep's all collminating my scope. the laser reterned perfectly to the focuser as did the doghnut of the barlow laser for the primary... the laser prooved useless in detecting this abberation. not that it happens to everybody but something to be aware of when using newts
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