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I had to put this project on hold for the whole of February due to piled up pay work but now I'm getting to a point where I can start moving ahead with it again.
Over the last few days I made some improvements to my Bath interferometer that I intend on using to test the Mangin mirror for astigmatism, before and after removing the central part that has been partially trepanned.
Last night I tested a 6" Bushmaster primary mirror, or rather used it to test the interferometer - as the mirror has already been measured with the previous iteration of the Bath.
You can still see the trefoil distortion caused by the three clamps, although I have slacken them already.
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