AF-I lens
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Auto Focusing Internal Nikkor lenses. Introduced in 1992, the AF coreless integrated motor is inside the lens itself and not on the camera body, making for faster autofocusing in large high-end telephoto lenses. The first were the 300mm f/2.8 and the 600mm f/4, both D ED IF AF-I. These lenses are the predecessors of the AF-S type versions.
