Quote:
Originally Posted by Joshua Bunn
it could be from shifting collimation from the secondary as i slew to a low altitude. I should perform this test at the zenith hey.
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Could well be Josh. I thought that may well be the case if the secondary was spring loaded (more tension needed), but referencing documentation highlights that the 12.5" and 17" are not, only the 20" is has a spring loaded secondary.
http://planewave.com/wp-content/uplo...re-v112712.pdf
I agree it would be good to perform the tests at zenith.
Given mirror spacing is critical for this design, one would expect it to hold collimation extremely well.