[ATM] Ronchi pattern

[Frans Franssen <f.franssen@planet.nl>]

Hello list members,

When looking at the Ronchi patterns of my full thickness 10" F 5,2 plate
glass mirror after having tried to parabolize starting from a sphere, I
see the lines inside the ROC sharply bend outwards at the edge of the
mirror and inside the ROC they bend outwards at the edge. Does this mean
I have a badly turned down edge or is there another error which I don't
interpret rightly? I have  applied the long W stroke MOT method and my
pitch lap is on the hard side.I would appreciate your judgement.
Regards, Frans Franssen


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