At 05:03 16/12/00 -0600, Yen-Yi Liu wrote:

>The reason the white lenses are white because some of the white lenses
>contain flourite, which permanently distorts your image (it literally starts
>melting) at around 150 ~180 degrees F.  The white color keeps the lens at a
>cooler temperature than a black colored lens.

The 100-300mm f5.6L has one fluorite element, and is black.

Rodrigo Gimenez
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