I'm having the same dilemma right now in choosing between these two lenses. Some of my statements might be contradicting sometimes but it just shows how undecided I am.



What I considered so far:
  • The f4 IS has better image quality than the f2.8 IS
  • The f4 IS has the latest IS
  • The f4 IS is a lot cheaper. I can buy a second body with the money I'll save from getting the f2.8 IS
  • The f4 IS can be considered as more portable compared to the f2.8 IS
  • The f2.8 IS has a full one more stop advantage
  • f2.8 can become f4 but not the other way around
  • The f2.8 IS is heavy, though I haven't tried it yet but from what I've been hearing, it can be a shoulder bender :P
  • The f2.8 IS is more versatile in most situations
  • The f2.8 IS has an included tripod ring (just saying :P)
  • The f2.8 has better bokeh




Yesterday I was leaning towards the f2.8 IS but with the cash that I have to shell out, I'm having second thoughts. Though it can still be attained. I just have to wait a little longer compared to getting the f4 IS but I might regret not getting the f2.8 and that's what's scaring me. hehe. A friend told me that I'm better off getting the f4 IS instead since I'm just a hobbyist. If I ever gain income from taking photographs (which I hope I will be) then that might be the right time to save up and get the f2.8 IS. I'm a bit in a hurry (for nothing hehehe, maybe from owning one I guess) and that is somewhat a factor too. :P


If ever I go for the f4 IS, I might keep it and get a f2.8 IS as well but that would take ages before I have those two. hehe..


Any comments and suggestions from you guys would be greatly appreciated

Also, my current gear is a 450D + 17-55mm 2.8 ISU. I'm planning to get a second body

Last thing, is it true that there will be a f2.8 IS Mk II soon? It's been rumored for a long while since it's already been a long time it was released. Not sure how true it is but it's a possibility right?