AF (Autofocus)

When applied to a lens, it is the ability of a lens to focus automatically on an object within its focusing sensors. When on Auto bodies, there is no need to use the aperture ring in auto modes. They are AI-S lenses with a built-in CPU and motor for AF operation. When applied to a camera it means it is equipped with autofocus capability (a CAM module) to perform with an autofocus lens.

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