Stoned said:Obviously it's not as good wide open. Somewhere between f5.6 and f8 you'd be hard pressed to tell the difference. It is however, only about 20% of the cost of the 24-105. That's not to mention it gives you 135mm, where the 24-105 doesn't. The 80% isn't worth the IS and f4 IMO, but that's your call.