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Yes Stefan, by batinov focusing the large stars, It turned out that the small stars had an extended triangle shape and that's how I established what was happening for the 3 primary mirror positions.
My secondary holder was actually 50mm wide and hardwood. Full coverage of silicone at 1mm or less thick. Sounds like you may have pointed to a potential issue here.
Anyway, the secondary assembly is fully apart and I have developed an alloy mirror holder instead. The mirror fits with an ever so small free play and temporarily firmed up with side tape.
Thanks Phillip, Perhaps too much coverage area also makes silicone too rigid. I think a thin x 3 pea size points seems to be the consensus, which I didnt have.
Hey Joe, as yet, I am still hopeful that it's a mirror mounting issue, So with an absolute pinch free optical train coming together, we'll know for sure.
I didnt know of a secondary mirror test Doug. I'm curious on how that goes next time.
Thanks everyone for the help and direction,
Look forward to getting under the stars soon (after my silicone cures)
Dan.
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