This is going to make it a lot easier to time your shots. When you remove the focusing job from your shutter button, there’s no danger that the focus point will change just because you hit that button. You focus one time, and then you’re free to take as many photos of that subject as you want without having to refocus. With back button focus, you don’t need to keep refocusing. Once you’ve pressed the shutter button down all the way and then lifted your finger again, you have to refocus in order to take a second exposure. Unfortunately the focus you get when you use one shot is only good for a single exposure (or set of exposures, if you’re using burst mode). In this mode, when you push the shutter button down halfway, your focus locks and stays put. Canons have a feature called “one shot,” which is a focus lock mode. Let’s look at some examples of what I mean.Īutofocus works a little differently depending on your camera. The reason this matters is because when your shutter has the dual job of both focusing and actually taking the picture, it can be difficult to coordinate both of those things. When you remove the job of focusing from your shutter button, you leave it to do the thing that it does best: making the exposure. OK, so why would I want to do this?īack button focus makes focusing simpler and more precise. With back button focusing (also known as BBF), you use a different button to focus and you leave the shutter button in charge of that one important task: actually taking the photo. Back button focus is an alternative focusing method that takes the job away from your shutter button, freeing it up to do what shutter buttons are supposed to do, and that’s, you know, releasing the shutter.
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