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Refractor question

Started by P. Tanner, 04/30/2002 09:37PM
Posted 04/30/2002 09:37PM Opening Post
Did AP at anytime ever produce any achromats?
If so what years?
Paul
Posted 05/01/2002 02:50PM #1
As I recall, Roland Christen wrote once that he had produced a single achromatic lens, and it can be found in his desk/cabinet/something.