"Thomas M" wrote in message news:oJ42c.74189$A12.52233@edtnps84...
This method avoids many problems associated with other forms of lens
"grinding." The process has been commercialized and could have a
marked
effect on the cost of implementing aspherics in eyepiece designs.
Now I'm waiting for the distortionless, Plossl-sized eyepieces with
100 deg. fields for $200!!

What about cheap objectives with above average quality?

I don't know how large a lens it can be applied to.
-Rich