Looking good Peter.
It couldn't be astigmatism could it..? Astigmatism causes triangular stars. Have you over tightend the collimation or something maybe?
Maybe you already know but an easy test for astigmatism is to just move in and out of focus while looking at a medium bright star, if the star is slightly elongated or oval at all one way inside focus and then this slight elongation turns 90deg outside focus that's astigmatism.
Mike
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