This lens covers the extremely popular 17-50mm focal length range (equivalent to 26-78mm in the full-frame 35mm format) making it extremely versatile. It delivers impressive sharpness and striking contrast over its entire range of focal lengths and apertures. Delivering a fast f/2.8 aperture over its entire range of focal lengths for maximum creative flexibility, at its maximum aperture of f/2.8 it produces beautiful images enhanced by shallow depth of field and excellent bokeh (i.e. smooth, natural transitions in the out-of-focus areas of the image). Equipped with Tamron's state-of-the-art, tri-axial Vibration Compensation (VC) image stabilisation mechanism, which controls the effects of camera shake, this lens provides more opportunities for sharp handheld photography at the slow shutter speeds needed when shooting in low-light conditions (e.g. night or indoor scenes), dramatically enhancing the user's level of photographic freedom.