Yeah, I know these threads come up from the newbies all the time, but I'll try to provide enough info so that you guys can help with some decent advice. Canon 30D user and in need of a decent zoom lens. Current longest zoom is the Canon 28-135 IS. My primary need is to shoot my daughter's indoor cheerleading competitions. This was discussed in this thread: http://forums.offtopic.com/showthread.php?t=3672027 as I am shooting in a very similar environment to what Xenon Supra described. I need something that will shoot decent in moderately low light and approx 150-200mm zoom. I would obviously like to have it as a zoom lens I can carry for general purposes as well. My budget is less than $1000 ... preferably $700-800. I'm considering the 70-200 f/4 L, but not sure if the f/4 is going to be enough. It would be an improvement over the f/5.6 that I'm using on the long end of the 28-135 currently. Obviously IQ would be dramatically improved as well. Another option is the Sigma 50-150 f/2.8 or the Sigma 70-200 f/2.8. Both run about $750. Downside on the 200mm is the weight as tripods are usually not allowed in these competitions and carrying around that lens all day would probably get old after a while. The 150mm would make a great carry lens, but I'm not sure on the reach ... it would be really nice to have the extra 50mm. Should I save $200 and go with the Canon L and hope that f/4 is fast enough? Or should a go with one of the Sigma's to get the f/2.8? Any other lenses I need to look at in this range (pricewise and focal length)?