Hi Tim.. I have been on the MM boards for awhile.. I am sure you may recognize my name from over there, or from sending things into MDP. I finally decided to register over here as well, and join the discussion as best I can. I teach digital photography classes as part of my job out here in Oregon. Yesterday I was teaching a class and had a question I just didn't have enough experience to answer. I am hoping you may have an opinion or anyone may have some resources so that I can steer this guy in the right direction. Here is his e-mail to me this morning: "Hi, We talked at the end of your photo presentation at the Homecoming Rally. I was wondering if you had any information you could share on a reliable independent source of lens testers. I am trying to determine if I should purchase a 1.4 or 2.0 tele-converter to extend the focal length of my lens, or should I purchase the lens at the required focal length without considering the tele-converters. Of course Canon's position is the lens and tele-converters are perfectly matched and there is no difference between image quality of a single lens or a matched lens and tele-converter. I have been looking for an independent study on the subject but have found nothing yet." So there you go.... any insight? When he came up to me after the class and asked the question, I immediately thought about you and wondered if you would have more experience in this arena than I do. Thanks for the help!