Originally posted by ricardobeat Quite a lot of space "wasted" around the lens elements. It's 2009, isn't it possible to get rid of all those thick layers of plastic/metal?
I'm guessing this is a weathersealed lens.. you'll need volume To compress and space for the rings/washers etc. If the lens would be (near) airtight and there'd be little air volume, you'd be compressing the air in the lens quite a bit, making zoom action really tough. (You already feel that on the 16-50 when engaging the second stage). At least, that's what I think..