I shoot the U.S. Open (tennis) from the stands every year. On a 40D 200mm is perfectly acceptable (except in Arthur Ashe Stadium). Now I'm using the 5D and I want that same reach. Using a teleconverter on my 70-200 2.8IS is a possibility.


I can't afford the 300/2.8 and they won't let you in with it anyway unless you're credentialed. The 300 f/4 is tempting but I keep coming across these great reviews of the 70-300 f/4-5.6.


Bryan's is the "worst" one I've read and he never says it's a bad lens, he merely points out its deficiencies. I'm hoping to hear from folks who've shot this lens. I'm specifically interested in the IQ at 300mm on a FF sensor.


Thanks for any thoughts and experience you can share!