Re: [ATM] my first RONCHI test, with video of it

["Mitch" <funnybone101@earthlink.net>]

Assuming inside ROC, it looks like an oblate ellipsoid (i.e. edge zones
focus shorter than center).
If the mirror indeed is polished out, I'd lengthen my strokes and work TOT
mostly.

   Arjan

Watch the ronchi carefully though. A TDE MUST, I REPEAT must be avoided or
it will be a real pain later. Look for any little "hooks" at the edge in
either direction indicates your edge is turning one way or the other.
Remember to press good and often. Cold presses are easy to do and can help
greatly. 

Mitch

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