Please disregard the intermittent dyslexia. :-p
Last winter I shot several indoor figure skating competitions from the stands with my Rebel XTI, and the Sigma 50-150 F2.8 II (because I doubted my ability to physically hold up the Canon 70-200 F2.8L all day). Although I was very happy with the results in general, I felt that overall they were too dim, and that I missed too many good shots by a split-second. I experimented with different settings (Aperture, Sports mode, ISO changes, etc) and still had the same problem: too many dim shots, too many taken too late and/or out of focus. I want to do better this year, but I'm getting all sorts of conflicting advice, from professional photographers to dealers to my fellow amateurs:
1.) Ditch the Sigma. Suck it up and use the 70-200. Canon L will beat any Sigma hands down, and the XTI will do everything you need it to do.
2.) Ditch the Sigma AND the XTI. Upgrade to the 40D. You can't take good sports shots with the XTI no matter what lens is attached to it.
3.) There's nothing wrong with the XTI/Sigma combo. It's all in the skill, or lack thereof, of the photographer.
Leaving aside the full-frame and shots-per-second advantage that the D40 has, I'd be grateful for any clarification or suggestions.
Thanks in advance!!