Sigma 18-35mm F1.8 DC HSM Art Lens For Canon EF-Mount

* USB Dock Compatibility Sigma has developed special software (SIGMA Optimization Pro) that can update the lens firmware and adjust parameters such as focus. * ART Lens Engineered for those who see photography as a critical expression of self, our Art line offers sophisticated optical performance and abundant expressive power to deliver faithfully on your artistic vision. * ASP Aspherical The aspherical lens complex allows freedom of design, improved performance, a reduced number of component lenses and a compact size. * 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 specialized design gives these lenses the ideal properties for digital cameras, the compact and lightweight construction is an added bonus! * HSM Quiet & Fast Autofocusing This lens uses a motor driven by ultrasonic waves to provide a quiet, high-speed AF. * IF Inner Focus To ensure stability in focusing, this lens ...