Another addition to the Sigma Global Vision Contemporary family is the SSigma 18-300mm f/3.5-6.3 DC Macro OS HSM Contemporary Lens. Having 4 FLD with 1 SLD glass elements, the lens would give incredible contrasted and sharp images up to the focal length controlling aberration. It runs in an optimised hyper sonic motor (HSM) that guarantees quiet and fast autofocus. As a super compact high-ratio zoom lens, the enhanced optical stabiliser (OS) balances camera shakes. To control the light passing through the lens, a minimum aperture of f22 is paired with 72mm filter size to produce high quality images. It is compatible only with APS-C DSLR Cameras. Focal length simulator The focal length changes the angle of view in an image. The longer the focal length, the smaller the angle of view and the greater the magnification. DC for digital These are special lenses designed for APS-C size sensors so that the image circle matches the smaller size of the image sensor of most digital SLR cameras. Their specialised design gives these lenses the ideal properties for digital cameras, the compact and lightweight construction is an added bonus! Optical stabilizer This function utilises a built-in mechanism that compensates for camera shake. It dramatically expands photographic possibilities by alleviating camera movement when shooting by hand held camera. Quiet and fast autofocusing This lens uses a motor driven by ultrasonic waves to provide a quiet, high-speed AF. USB Dock Compatibility Sigma has developed special software (SIGMA Optimization Pro) that can update the lens firmware and adjust parameters such as focus.