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Hands on test of the autofocusing features of the Canon Rebel T4i and STM 18-135mm Lens. Includes a comparison to the Canon EFS 18-55mm (a "non-STM" lens).

Overall the Canon T4i provides some nice AF features, including fast and responsive touch-focus and smooth and quiet full-time focus. But we found the T4i still has a hard time tracking subjects moving faster than a slow walk, especially in low light conditions.


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