Hi folks,
What is the best lens to take photos of toddlers and moving babies. With just borns it is easy - My 100MM macro works perfectly (f2.

. just born don't move much and the speed of focus is fast enough.
This weekend i was taking photos of children at a birthday party (friends party and i was just a guest playing with my camera) and found that i like the separation of the 100 mm macro, but the speed of focus was not enough. I took out my 24-70 and found the focus OK but the separation wasn't there. I also felt that the 100 mm was just a tad too long for the space i had at the party.
I was first thinking 85mm F1.2, but then realized that the focus speed is too slow. So my question on what is best?
I also have a 70-200 zoom, but that just scares the kids and I can't run around the place as easily with the monster zoom
