<p>I've got myself a new D810 and all these AF intelligent modes are quite new to me. My aim is to shoot pictures of motorcyclists riding their bikes and catching them preferably in frontal 3/4 view coming towards me. They'd be travelling at about a 100km/h or so and am confused as to which AF mode I should use and what the AF lock button does exactly. I've also got my trusty 70-200 f/2.8 and since I live in Malta there would be more than enough natural light at the shoot. Can you help me set my camera?</p>
