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Re: To Filter lens Or Not?
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.
Canon 60D -- EF 70-200 f4 L IS -- EF 100mm f2.8 L IS Macro -- EF-S 60mm f2.8 Macro -- EF-S 17-55 f2.8 IS USM -- EF-S 10-22 f3.5-f4.5 USM.
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