I've been casually looking for a f/2.8 telephoto for occasional night sports, trying to work within, as I recently read elsewhere, "a married man's budget". I've rented the 70-200 before, and it is terrific, but is heavier than I like, usually running up and down the sideline to try to more or less keep up with a soccer game. My current clever idea is a 180mm f/2.8. When I rented the 70-200, it was rarely not fully extended, so a fixed FL is a minor issue for me. I was wondering if anyone uses a 1.4 TC with a 180, and if it maintains AF with the TC. I wouldn't expect to use the TC at night, but it would be an added benefit to be able to use the TC during the day. The images I've seen posted with that lens look beautiful; would also be interested to know if it is TC-AF capable, opinions about any degrade in image quality. Appreciate any feedback.