and of course the 2.8 IS is officially discontinued.


you think it's silly to buy the f/4 (either one, but prob the non-IS since it's "only" $600) if I already own the 2.8 IS?


I can't help but think of the times when a much lighter 70-200 zoom would be a real benefit - and all those times are outdoors in the daytime...walking around the city, shooting at the U.S. Open...


What holds me back is investing $ in the same focal range seems wasteful...esp when I'm trying to save for a T/S...


It's not so much that the 2.8 IS is so heavy, it's that the f/4 is soooo much lighter!