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Tandum,
No its not primary mirror movement as its fixed place. The scope is a Planewave CDK 12.5". Yeah the primary is fixed in place and it appears not to move from my bench tests using a micrometer.
Thats all ive got to go on - and the fact that collimation seam to hold (just by defocusing and getting concentric circles) at orientations where in focus stars are elongated.
Thanks
Josh
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