TAMRON SP 17-50MM F2.8 XR DI II VC LD NIKON
Super Performance series
Performance takes priority for superb image quality This line of ultra-high-performance lenses is designed and manufactured to the exacting specifications demanded by professionals and others who require the highest possible image quality. The foremost priority is achieving superior performance parameters Ð high design standards take priority over cost constraints. As a result Tamron SP lenses feature innovative designs that have established an enviable reputation for excellence amongst demanding photographers.
VC Vibration Compensation
Compensates for camera blur on long shutter speeds Ð for sharp images in much lower light TamronÕs unique VC mechanism uses a proprietary actuator and algorithms to deliver an extremely stable viewfinder image with excellent tracking. The mechanism employs a tri-axial system in which three driving coils move internal optical components within the VC lens electromagnetically. The VC lens elements are held in place only by contact with three ball bearings Ð which in the latest Tamron VC lenses are ceramic Ð achieving smooth movement with minimal friction. The simplicity of this mechanical structure is also one of the secrets of TamronÕs compact lens sizes.
Compact size with a filter thread of ¯72mm while delivering both a large f/2.8 diameter and VC
The addition of an image stabiliser tends to increase the size of a lens. As this lens is a large-diameter f/2.8 zoom the optical image stabilisation system is also relatively large compared with other VC models. However through improvements to optical mechanical and VC designs the filter thread is a compact 72mm.