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Old 02-06-2019   #37
David Hughes
David Hughes
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David Hughes is offline
Join Date: Dec 2007
Posts: 7,665
While you are all here can I ask if the advent of optical grade plastic meant that a lot of glass compound lenses were replaced by one plastic lens?

I'm thinking of the triplets that look remarkably like the "4 in 3" glass Tessar.

Regards, David
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