Re: ATM Figuring help

["Bob May" <bobmay@nethere.com>]

It looks like you dug a nice hole in the center.  I suggest that you first
find out what the center to edge zones distance is on the tester and see if
you are past the parabola on the edge and if you are, it's time to do some
spherical strokes until you work the center-edge distance within that number
and then you can go back to parabolizing.  If you are not over, just keep
going with the parabolization without going so far over the edge as you have
been doing.  I think that your difference center-edge should be about .067"
or so so you are probably well over the limit.  I also suggest that you use
a mask set that is about midway between the linear step and the recommended
set that TEX wants in order to keep the center small enough to be able to
get a good even shading when finding the center.  Large centers tend to make
the determination of the center hard as does small ones.
Bob May
My new web space address is http://webu.wigloo.com/bobmay/ or
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and my new email address is bobmay@nethere.com
Bob May