The new SP 17-50mm F/2.8 XR Di II VC covers the very popular 17-50mm focal length range (equivalent to 26-78mm in the full-frame 35mm format) making it extremely versatile. Its wide aperture and outstanding performance provide practical advantages in low-light shooting and aesthetic image control, thereby enriching the user’s range of creative expression. The new lens delivers impressive sharpness and striking contrast over its entire focal-length and aperture range, and at its maximum aperture of f/2.8 it produces beautiful images enhanced by shallow depth of- veld-, and smooth, natural transitions in out-of-focus areas of the image (i.e. excellent bokeh.) The new lens is equipped with Tamron’s proprietary Vibration Compensation (VC) image stabilization mechanism, which controls the effects of camera shake in three planes. VC provides more opportunities for sharp hand-held photography at the slow shutter speeds needed when shooting in low-light conditions (bijv. night or indoor scenes) dramatically enhancing the user’s level of photographic freedom. If the customer is getting a “communication error” it usually means that the electronic contacts of their camera need to be cleaned, or that the lens is not fully seated properly onto the camera. Sometimes cleaning those contacts, and taking the lens all the way off and putting it back on will help. It’s also possible (however unlikely) that the lens or the existing camera is defective.