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Old 02-04-2019   #19
pgk
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Join Date: May 2011
Posts: 232
Aspherical lens surfaces are used in all sorts of applications, some expensive, some not. Most are now molded but in the past they were ground which was far more expensive. They have advantages for the design and build of lenses in terms of optical improvements, size, simplicity and so on. The poll is far too simplistic to have any value.
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