As I don't often have a chance to browse camera stores, I do most of my shopping online, which has some restrictions (as far as I'm concerned).
I have one L lens (17-40) and absolutely love that all the zoom movement is internal, without any rotation of the front element. On the cheap lenses I began photographing with, the lens would vary in lenght according to the focal length setting, and the front elements would move all over the place, making circular polarizers a pain to use.
I can't seem to find under specifications on places like B&H saying whether a lens has this "feature" or not. I've been looking at the Canon 28-135 IS, but am stumped. Does anyone know if the lens functions similarly to my 17-40 as described above?
Sorry if this seems like a pathetic question, but sometimes its those small things that pester us.