I've got one of these coming today (courtesy of John Griggs), and I'm wondering if you guys could confirm something for me. The filter threads are attached to the front lens element structure, which moves in and out as it focuses? What I'm used to and what I have on every other lens / camera is a clear filter / lens hood if possible up front so I can ditch lens caps for the bag when I'm out and about. But I don't like the idea of putting any pressure on a moving, motorized part. Am I out of luck with the 27?