Thats a very good point mate .... If your primary use for the lens is going to be the kiddies indoors, a Tamron 17-50 2.8 or a 35mm 1.8 of some variety are worth considering. The Tamron is a fantastic bang for your buck lens. You might find that a 10-20 or similar will give for a fair bit of barrel distortion if working in tight spaces. You dont want your kids looking like coneheads