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Old 05-16-2012   #61
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Default Re: To Filter lens Or Not?

Originally Posted by w7apd View Post
You may be right; after all, Canon only marketed their first fluorite lens 38 years ago.
Actually it was in 1969 (FL-F300mm f5.6) according to a Canon Professional Network article. Makes it 43 years ago.

Also fluorite lens elements are too fragile to be used as the end element in a camera lens. If such is required, then the fluorite is typically protected by an outer layer of optical glass. I don't know if they ever produced a camera lens with an exposed fluorite element. Fluorite is difficult to grind because of its fragility, which is why lenses using it cost so much more than those with ultra low dispersion glass. Many Canon L lenses use both, and it's my understanding that the fluorite is an internal element.

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