After much waggling around and much more confusion on the lens that I am to buy, I have decided on the Canon 70-200mm f/4.0 L USM lens. No doubt its a bulky one- the other day as I had been to get my camera back after a sensor cleaning exercise, I noticed the Sigma 70-200mm there at the store, and out of curiosity asked for a test use. Boy, did I say I was thoroughly impressed? The image quality, the auto focus and the near silence (well, I was on Broadway and so the lens might not have been all that silent) while the lens zeroed in on the focus was pretty impressive. The lens did was hunting for focus at far ends of the zoom- at 200mm that is. But it was also possible that there wasn't much to focus in a bland background.

I am already not satisfied with the hunt that my 18-55mm "with kit" canon lens offers- but I can live with it. Hopefully, the 70-200 would let me do some serious and good shooting. But, I would have to space my purchase for sometime. I can't buy the lens right away. Need to plan- may be in another couple of months I will be a proud owner of a canon 70-200mm f/4.0 L USM lens.