Balsam still works fine and is probably the best replacement in terms of
matching the original performance.

Clear Skies

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

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

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"brian morse" wrote in message
om...
Hi All, I am renovating a wide angle eyepiece system and found that
the cement between one of the achromats had developed many bubbles. I
soaked the lens in acetone for a couple of days and succeeded in
dissolving the old cement. Could anyone tell me what kind of cement to
use to re-attach the two components. I have some Canada Balsam which
is fairly old (about 35 years) but think that there must be something
better to use by now.
Thanks Brian Morse Vancouver.