Just got Kenko x1.4 Pro Extender over weekend. All my Canon lens fit perfectly to 30D - no rattling, no problems with fit. The Kenko seem to be a little loose. When attached to 30D, I can wiggle it a little (very little). With 70-200 attached, I can feel a small (very small) wiggle when I change distance. Not much wiggle, but distracting when I'm used to perfect fit of Canon's own lens. For close to $200 and a "Pro" version, I was expecting something with a better fit. Is this normal for Kenko product? Extender worked well with my 70-200. Would like to know if I got a lemon and should get it exchanged. Thanks.