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help with focus problems please


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hi all,

i`m unable for some reason to get the stars, especially big bright ones to focus properly, i`ve tried taking the reducer flatner off and just having a extension tube connected to the camera / filter wheel straight into the focuser and they still look the same, on one side it looks like an egg ! starting to drive me made and not sure what the problem is, everything i can think of is tight including the focuser, the equipment i`m using is a William Optics GT81, starlight filter wheel and an atik 460 camera, i`ve added a couple of pictures to show the focus is good using a bantinov mask and a 1 second image of vega, any ideas gratefully received. 

bantinov.thumb.jpg.6a57cc1aa20ce92a9a814817faa703d5.jpgstar.thumb.jpg.b08799ef19d156cb5bb7839812cae41c.jpg

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