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I just had a brain wave and thought to put an eyepiece in the focuser and lock on to a star then defocus it into a round donut
So I went outside and did just that , locked on to Altair with my 10mm Delos , defocused and my donut was ovoid shaped with the hole offset from centre, not round with a hole in the centre
So am I correct in saying my optical train is not aligned , probably the primary mirror not square in its support frame ???
Note: I did have the primary mirror moved forward by 4mm to give me more in focus for my DSLR which was carried out a month ago, they used spacers made of compressed cork
Welcome any advice and comments for my frustrating issue
Thanks
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