Not sure I really know the answer, but you'll find that all of the "long" zooms (>130mm??) are white, whilst the landscape lenses (<130mm) are black with a red ring.
Allegedly there is an "urban myth" that white lenses stay cooler than black ones and therefore work better .... (not sure I buy that).
More likely it's so that every one says "hey look he's got an expensive white lens" MARKETING WORKS, CANON ARE NOT DUMB!!
Not that they make the best kit either .. other manufacturers and lens suppliers are available and may (I dunno) be even better
(said the man with a glorious super splendiferous expensive white lens )
i think it is lenses 200 and over. most obvious is the status symbol, canon claim it is to reflect the heat.
i read somewhere on here the l stands for the coating on/type of glass, but dont quote me on that.
The longer lenses contain flourite elements which is very critical on temperature (and is more brittle than glass) so the apparant reason is that its to reflect heat.
The real reason is probably marketing. Everyone associate white lenses with Canon.
could be a heat thing i was reading a review on spotting scopes
and one of them suffered in the heat the image degraded terribly
but when it was protected from the heat it was fine
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