TOKINA AT-X 70-200mm F/4 PRO FX VCM-S lens featuring a new Vibration Correction Module and ring-shaped ultrasonic style auto-focus motor. This lens is designed for digital cameras with full sized sensors as well as APS-C (DX) sensors. This technology allows for up to 3 stops of vibration correction to reduce the affect of camera shake in situations were a tripod or monopod cannot be used. Additionally the new 70-200 Lens features a complete ring-shaped ultrasonic motor for faster and quieter auto-focus. This new motor allows for the minute adjustments between AF and manual focus modes dramatically increasing operability. The "S" denotes the new ultrasonic motor. The optical design of this lens has 3 SD (FK01) Super-low Dispersion glass elements to correct for chromatic aberration and maintain heightened optical quality throughout the zoom range.