I just got this lens for a song here on the forum, THANKS DABO!! and I already had a 77mm uv lens on my sigma 70-200 so I tried that one as I was wondering if it would vinette and I noticed the glass on the lens when you zoom moves in and out. I put a peice of paper inside the lens-filter to see if it would actually touch and IT DOES! I would warn everyone with this lens to be very carefull what filters you use on this lens. its when you zoom all the way to 24mm that the lens sticks out the most.