The continuous shooting mode and the “continuous autofocus”, are also often mixed up. By the way, who at Canon came up with the name “AI Servo” for this mode? But that doesn’t really have anything to do with the topic now …
Where does the confusion come from?
Many amateur photographers assume that continuous autofocus can only be used in conjunction with the camera’s continuous shooting mode. Of course, with moving subjects, it often makes sense to use both the continuous shooting mode and continuous autofocus to increase the chances of getting a sharp photo. In fact, the “Sports” mode can basically combine these two functions. But it’s not an absolute necessity. Of course, you can use continuous autofocus for single shots as well. And in the same way, it is possible and often useful to combine the continuous shooting mode with the “normal” autofocus (single autofocus, one shot,…).
When does which combination make sense? And when not.
Continuous Shooting Mode and Continuous Autofocus …
… makes always sense whenever a subject is moving toward or away from the camera, like the cougar in the image below.
However, if the object is moving parallel to the camera, i.e. if the distance to the camera remains the same, it is not absolutely necessary to use the continuous tracking autofocus. In these cases, simply try using the single autofocus.
Single Shot and Continuous Autofocus …
… makes little sense with static subjects, such as architecture. With static subjects, the plane of focus is determined by focusing on a specific autofocus point (often the center one) and then, with the shutter release button pressed halfway and panning the camera to compose the image, the continuous autofocus is actually counterproductive. When the camera is panned, the camera would immediately refocus and the focus point would not be at the desired position.
Continuous Shooting and Single Autofocus …
… is the default setting for me. Since I mainly shoot static subjects, the continuous autofocus is rather a hindrance for me (see above). But then why the continuous shooting mode? Quite simply, if something does move, I don’t have to activate the continuous shooting mode first, but can “keep on shooting” straight away. And with a little practice, you can easily take single shots even with the continuous shooting mode enabled.
And why not let the camera decide on single or continuous autofocus?
All cameras also offer this option, sometimes called AF-A or AI focus (with Canon). But my personal experience with it is, let’s say, rather dubious. I prefer to decide for myself. But your experience may well be different.
I hope you enjoyed this mini series. As always, please feel free to leave a comment.
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