If you haven't looked at the 24-105mm F4L, it is almost exactly the same size and weight as the 100 F2.8 macro. The 100 is slightly longer. If you are going to use the 24-105 as your "walkaround" lens, it's a pretty large package to pack around.


When I was shooting with my Digital Rebel (cropped sensor), I used the 17-40 as the walkaround lens. It was excellent covering 27mm to 64mm equivalents in full frame. I prefer having wide focal lengths easily accessible in my style of shooting.