Took the kids to the park today. The swing shots are with the 18-105mm. Did pretty well on swing motion, but certainly not a high hit rate (about 15-20%), which isn't terrible for swings, since most any camera falls on its face with tracking swing motion because it's very close, erratic and accelerates and decelerates rapidly. This makes two cameras (X-T1) that I have that can actually do a passable job on swing shots. The other shots are with the Sigma 60.