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Hi again,
Thanks Cristian for the pics, I found a page online similar to what you posted from someone selling ronchi eyepieces.
You were right I did go a little to far and made a hole, I was getting it back to front. I did about 20 min 1/3 MOT last night and the hole in the middle is practically gone, I am not sure of the edge but, I think it has improved as well. Even gone slightly past a sphere and more ecliptical?
Was very difficult to get the knife edge pics as seemed real touchy.
I am so supprised how quickly the surface changes after such a small amount of polishing!! Would I be ready to try to parabilize from here? Also I have noticed that there are small depressions etc (dog buscuit?) are these worth worrying about or would these be too small to degrade the image.
I would be very happy with my first mirror 1/4 surface error or better!
Thanks Gary
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