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So why bother posting two foucault pictures at a different knife edge setting unless you are just being 'sloppy' or intend to make the appearance to the uninitiated that you have had to make some large change to the mirror , which shows a flat edge in your `before ' photograph. ( and for that matter why post Figure XP data to a forum when you say that in fact the mirror was `much worse ') .
What exactly was wrong with the mirror that meant you can not put faith in your measures `before' but you can `after' . The narrow turned edge could have been masked with texta for the sake of accuracy in your knife edge measurements. I've certainly looked at optics from this maker and never seen any surface roughness that would remotely prevent some reasonable quantification of its surface errors .
Just trying to encourage a little more rigor here if you are going to be comparing any results of different makers or promoting your own skills in 'fixing' them .
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