From: "Bill T." 
To: atm{at}shore.net
Reply-To: "Bill T." 


Good scratch-dig reference:

http://www.novaphase.com/Quote%20Guide.pdf

BTW a dig of "40" is probably not adequate for magnifying optics.

A more ATM accessible test for completeness of polishing is the focused
flashlight test.  If the focused caustic of a strong flashlight passes
unseen through *every part* of the surface of a mirror, then it's probably
polished enough.  A harder test is the focused solar caustic.  In any case,
be sure to scrutinize the very edge of the mirror which is typically the
last part to fully polish out, and the least well ground.  That's usually
where the biggest digs are.

Bill T.



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