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[ATM] Prescription Update

Here's an update of what appears to be a favorite (175 mm
f/12), using ECO glasses and allowing for some figuring
(0.4 microns from BFS):

	http://users.rcn.com/rflrs/t03-20x.len

I think one thing to note is that N-KzFS4 differs quite a
bit from KzFSN4 with respect to resistivity.  While it is
still prone to acid and alkali attacks, phosphate, water
and climatic resistance are quite a bit better.  I wonder
if this means it will be easier to work.

-- 

Rick S.

http://users.rcn.com/rflrs


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