From: "Mel Bartels" 
To: 
Cc: "atm" 
Reply-To: "Mel Bartels" 


>>>
Will the astigmatism ever polish out or do I go back to fine grinding?
<<<

Yes, given a time period of 'ever', 'stig can be removed, but do you want
to wait 'for-ever'?  My rule of thumb is to return to a grit size
sufficient to lose the amount of 'stig in the amount of glass removed in a
wet or two. Usually that means at least 500 grit if not all the way back to
220.  If you don't you risk sucking the tool against the non-spherical
mirror and deforming the tool, only reducing 'stig, not eliminating it.

Mel Bartels

--- BBBS/NT v4.00 MP