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Hi guys, I have taken some pics and measurements. The distance from the primary to secondary is 500mm and from the secondary to the eyepiece around 300mm, so it would be an f4 mirror. The secondary is 76mm and with the camera attached the focuser drawtube creates a large obstruction in the telescope tube. There are no lenses in the focuser. I think that the size of the secondary coupled with the focuser drawtube obstruction and 3mm thick spider veins are the cause of the aberations.Thanks Kevin I might take you up on the offer for a Ronchi test, the scope might be worth modifing if the mirror is ok.
Rick
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