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There's a useful Shutter button and focus behavior you can change on your D800. I am here in the Custom Setting menu, going into the Autofocus category, the first two items--a1 and a2--AF-C priority selection and AF-S priority selection. I am going to look at the second one first. AF-S of course is Single-Servo Autofocus. That's for locking focus once and then shooting. Right now it's set so that it will only take a picture when it's in focus.
I cannot fire a shot until it has locked focus. If I want, I can change that to Release priority, meaning it will absolutely take the shot when I press the button, regardless of whether it's in focus or not. And you may think, why would I want to shoot a picture that's out of focus? Sometimes maybe you're shooting a really fast subject or you're in a quickly changing situation where you're moving around a lot and you don't care about pinpoint-perfect focus; you don't want to miss a moment, even if it's a blurry moment, just because the camera is hunting around. At that time you may want to change to Release priority; most of the time you'll want to stick with Focus priority.
Up here, Continuous-Servo Autofocus, I've got the same options. It defaults to saying I will take a picture anytime you press the button. This is a good setting for Continuous-Servo Autofocus, because since it's constantly tracking focus, odds are it's probably pretty close to being in focus, even if it's not dead on. So you do want it to take a shot whenever you press the button. I can change it so that it will only fire when I have achieved focus--that is, when I get the circle indicator in my viewfinder showing that it has locked focus.
Notice that either of these modes which give priority to focus are going to slow down your continuous shooting. If you're used to fast shooting in Continuous- Servo mode, that's because it's not waiting to achieve focus before it fires the shot. If you choose either of those, you're going to have a harder time knocking off lots of photos in a hurry, because the camera is not going to shoot until it has arrived at good focus. So those are both things to fiddle with if you're finding yourself shooting fast-moving subject matter or in a rapidly changing environment where you're moving a lot and you're missing shots because the camera is hung up on being focused before it will fire.
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