The 70-210mm focal length has long been the choice of nature and outdoor photographers as an all-in-one lens for a wide variety of subjects and scenes. The constant aperture Tamron 70-210mm for full frame and APS-C DSLRs delivers 4EV vibration compensation when shooting handheld and is constructed with 20 elements in 14 groups, with three LD elements. The minimum focusing distance of 0.95m (3.1 ft) and the nine-bladed diaphragm combine to yield very pleasing bokeh effects. A Dual MPU (Micro-Processing Unit), internal zoom (which does not increase barrel length when zooming) and an Ultrasonic Silent Drive ring-type motor enable smooth operation and high-speed, accurate AF performance.