I literally never use these two focus settings. For all my work, I use the trusty S-AF MF focus mode. Every time I dip into these modes I find them uncomfortable to use when locking in on a moving subject. I recently tried the tracking and watched the image go in and out of focus thru the viewfinder. I experimented on got some accurate shots with one miss, but I just don't feel comfortable using it. Continuous auto focus doesn't instill much confidence either as the focus appears jittery. Anyone have any tips or thoughts on using these focus modes?