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Thanks all,
Not surprised I did it wrong (or only partially right) - I just massively de-focused a star and tried to centralise the obstruction - it was a fair way out of whack.
To fine tune it I presume you have to act on a just slightly out of focus star - either side of focus - as there are only 3 screws I can alter at the front. Still if the central obstruction is centred I presume this is pretty close to ideal?
Will look at CCD Inspector too Jase!
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