From: "mommoteandcoyote" 
To: "Steve Fejes" 
Cc: 
Reply-To: "mommoteandcoyote" 


Steve,

Bill is exactly correct!  There is no substitute for 0/0 pits / scratches,
and plenty of elbow grease. Watch the outside inch or so to the edge.  I
use a focusing pin light and a 10x loupe in a darkroom.  the center zones
will polish out rapidly unless you are doing something wrong and contact
isn't being maintained.  Spend the time pressing and polishing, and you
will end up with a perfect polish upon which to figure.

Coyot‚


----- Original Message -----
From: "Bill T." 
To: 
Sent: Sunday, February 02, 2003 11:21 AM Subject: Re: ATM polished surface quality


>
> 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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