Quote:
Originally Posted by Nico13
Barry,
I think the original problem was not a focus one but an apparent out of round outer ring while doing a colimation after fitting Bobs knobs.
See the first post.
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That may be so but reading between the lines on the 4th paragraph I get the impression that there was a focus problem before the fitting of the bob's knobs.
That out of round shown in the pictures is only a minor problem. It will be fixed by the preliminary setting of the secondary by adjusting the knobs to get the outer circle round before attempting a star test.
However the first thing to do is get the corrector back in its correct position.
I suggest reading Thierry leGault's article on collimation before anyone makes a serious attempt at collimation.
Barry