I wanted to see if anyone could recommend a relatively cheap ( under $500 ) long range zoom that is known to have VERY good optics/sharpness/distortion etc. I was thinking of trying to get a 70-200L f/4 NON-IS. Anything a little cheaper that would be comparible? I just want something sharp at all focal lengths. I was going to get IS, but rarely shoot in dark situations so I figured for wildlife I can just use a tripod or monopod at long distances.