Dear Tim:
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.
Yen
> I spent all day today at Eastern Creek raceway in Western Sydney under a
> very hot summer sky. After 4 hours straight with no shade you wouldn't
have
> believed the heat coming off the black camera body, by contrast, the
300/2.8
> with its white finish (but more surface area)was holding half the amount
of
> heat. For plenty of real life working situations I think Canon got it
> absolutely right. I don't really understand the ongoing preoccupation with
> lens colour - white is practical for outdoor work but other than that -
who
> cares?
> Tim
> nb: I'm always impressed at what these bodies can cope with and still
> function perfectly
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