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P3D Re: Apochromatic lenses More info please

>"apochromatic
>lenses are made of crystalline fluorite or other unusual types
>of glasses, have stronger elements (higher curvature)"
>    
>Could you explain what this type of glass does better than other
>types of glass and what you mean by higher curvature?

Sorry, I don't know more than the passage quoted from Kinglake's
"Optics in Photography".  The "higher curvature" was mine which
I think is a result of "stronger elements".  Stronger elements =
shorter focal length = higher curvature.

George


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