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| p.1 #7 · Question on AF system vs number of points vs FPS |
Not everything can be timed because it happens randomly. Then the option of higher fps is a great feature. What if racing car crashed or spun-out and you missed most of the action because the frame rate was too low ? Unfortunately none of the cameras have a feature that lets you delete a whole burst of shots in one go, and if you try doing it to individual shots then you'll miss the next part of the action.
Sometimes, too, if you are looking through the viewfinder then you may not know when the action is coming because you're watching the batter instead of the pitcher who is out of the scene, etc.
As well as fps, number of AF sensors, etc., you need to consider the processing grunt behind the AF system. Greater AF processing power lets the AF work correctly even at higher fps when there is less viewing time between frames and even when more AF sensors are actively contributing data. That's often part of what separates the likes of a D4 from the likes of a D800 or a D7000. There may be an extra processor dedicated to AF, or a more powerful processor, or just a faster processor (and presumably that requires a bigger battery to cope with the extra load).