>The cool thing about af-on and always being in af-c mode is >that you can press-release the af-on button and get the >equivalent of af-s focus mode or press-hold for continuous >focus, without needing to change focus modes. > >---------+---------+---------+---------+ >Joseph K >Seattle, WA, USA > >D700, D200, D70S, 24-70mm f/2.8, VR 70-200mm f/2.8 II, 50mm >f/1.4 D, >17-55mm f/2.8 DX, 70-300mm f/4.5-5.6 VR, 18-70mm f/3.5-4.5 DX >
And, provided you have an AF-S lens with A/M, you get the third Manual focus option - don't touch the AF-ON button, just focus using the lens' focus ring. That makes 3 focus modes with just the one button. Nice, I say.