Constant maximum f/2.8 Vibration Reduction technology Extra-low Dispersion Glass The Nikon AF-S 70-200mm f/2.8G VR IF-ED telephoto zoom lens is perfect for professional sports and wildlife photographers and serious amateurs with a fast-shooting full frame model, such as the D3s, thanks to the extremely bright aperture. A new incarnation is available, with the second generation of vibration reduction and a new optical construction, as is an f/4 option, but both are more expensive, making this lens great value. The Vibration Reduction technology virtually eliminates any evidence of hand shake, making it possible to select longer shutter speeds. This greatly assists exposure, as darker conditions normally require a longer shutter speed, which can often lead to motion blur. The extra-low dispersion glass also reduces the appearance of chromatic aberration, making purple fringing far less apparent on the end product.