Originally Posted by
Dan Fromm
OP, I'm glad that you're sharing what you found. dioptrique.info is a fairly well-known site and has been mentioned here many times but mentioning it again can't hurt.
You and RGB may not be aware of all of this site's resources. The easily-found ones are on the site's FAQs and articles, which can be reached by clicking on LF Home Page. A link to a slightly harder to find resource is in the first post in the sticky "Where to find information ..." in the forum's lenses section. By an odd coincidence that won't bear close examination, it has had a link to dioptrique.info since it was first posted.
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