Trying to get a better keeper rate with the Canon 70-200 f/4L (non IS) on a Sigma MC11 adapter, using autofocus. Sometimes autofocus works, sometimes it does. Having good light helps, but this wasn't particularly good light and yet the autofocus worked on the constant motion chipmunk - capturing one is a good test of AF ability! Sony's Flexible Spot Small focus setting seems to be good for this adapted lens.