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The Tokina difference comes from special material selection and assembly technology with micron-unit quality control. This ensures optimum consistency while maintaining top quality for each and every lens. That's why both professionals and knowledgeable amateurs rely on Tokina lenses.
The AT-X 17 lens features the exclusive "Focus Clutch Mechanism", a signature of the Tokina PRO series lenses, which provides a faster, smoother auto focus operation and a smooth manual focus action not normally found in today's auto focus lenses.