We use the following substrates:

Borosilicate glass.

Schott Supremax. 

Fused quartz. 

Pyrex.

All of our substrates are free from edge chips

or "clam shells".

After diamond generation, fine grinding,

polishing, and figuring, each

optic undergoes several hours of testing and

figure touch up, as long as needed to achieve a

nulled figure.
.
 We preform, not one, but several different

optical tests during fabrication.


The results from each test are then cross-

checked against each other in order to provide

an accurate representation of the optical

quality.


Our testing methods include.

*Foucault-Null Test (we do not offer Foucault

data reduction reports).

*Ronchi-Null Test 

*Figure of Revolution Test

*Interferometric Test  

Our data is composed of several hundred points

of data reference. The numbers are not usually

going to match Foucault data reduction, it's just

the way it is. I offer the interferometric data

page as a courtesy, this is done after all other

testing has been completed.