Background: I'm going on a major trip and am trying to keep the weight down while not sacrificing too much on IQ. I've already decided (I think!) to take my 70-200 AFS VR instead of my 70-300. Although I just read the 70-300 is very good for IR. I just haven't found the sweet spot with the 70-300 and the IQ of the 70-200 is wonderful. I thought I would take the 24-120 VR and use it on my IR D100 and keep the 24-70 on my D300. This would eliminate swapping lenses a lot. Now I find Bjorn rates the 24-70 as excellent for IR. (He doesn't rate the 24-120 VR for IR....) Question: Should I take advantage of not taking the 24-120 and just plan on changing lenses more often?