Chuck,
I'm convinced that these reported color-free fast achromats were made in
Synta's special division of experimental optics - Stupendousview ;-)
I'm sure the 6" f/6 achro is APO-like ie. APieceOf.. *g*

Believing is seeing.

;-)

Chuck Taylor
Do you observe the moon?
Try http://groups.yahoo.com/group/lunar-observing/

Are you interested in optics?
Try http://groups.yahoo.com/group/ATM_Optics_Software/

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Mario.