« on: Today at 02:57:32 PM »
Sony's superteles are white, too. I think when you make your lenses white it means "we're really super serious about photos, guys. Super. Serious." I'm gonna guess $8k intro price.
The whiteish colour is not just for good looks. It prevents the lens from thermic expansion (e.g. from prolonged sunlight exposure), which would lead to misaligments in the barrel (even a few microns can make or break it). At least, that's what the Canon has been proclaiming for years...
Reduces thermal expansion, it can't prevent it.