So I am traveling to, you got it, Africa. I am leaving late December and Ill be gone for 2.5 weeks. OBVIOUSLY, more important to have than clothing and personal hygiene products will be my camera. I purchased a Sigma 70-200 2.8 a few months back (tax return check!) specifically for this purpose. My only lenses before the purchase were my 85mm and my kit lens. I figured this would be a decent lens to get some good wildlife photos, as we are planning on doing a safari (I am also planning on investing in a decent wide-angle before I leave...Christmas present maybe, good ole' Mom). HowEVER...as I've been reading, I keep seeing authors and posters say that the mac-daddy telephotos (300mm, 400mm, 500mm and up) are what's needed for wildlife photos...which is sad, because here I have this cool lens, and an approaching trip to Africa, and the last thing I want is sucky pictures. They don't have to be PERFECT, but I would love some sharp, printable, hang-on-my-wallable shots. Couldn't I get a great shot with my Sigma and crop and zoom the image in PS? I guess my question is...what do you think? Do you think this lens will serve me well on my trip, or do you think it was a waste?