Why do my lenses continually hunt for focus?

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Why do my lenses continually hunt for focus?

There can be many reasons why equipment fails to find focus at all, ranging from dust on the camera’s AF sensor to misplaced optics in the lens. Before concluding there is a fault, however, it’s worth checking a couple of things. For example, is there sufficient light or contrast for the equipment to focus? And what is the minimum focus distance of the lens in use? If your subject is too close for that particular lens, it will not find focus.