Product Review: Sigma 18-35mm F1.8 Art DC HSM Lens for Canon DSLR Cameras (210101) with Sigma USB Dock + 64GB SD Card & Advanced Holiday Photo & Travel Bundle (6 Items) The Sigma 18-35mm F1.8 Art DC HSM Lens for Canon DSLR Cameras is a high-quality lens that offers excellent performance in low light conditions. The lens has a fast and wide aperture of f/1.8, which allows for shallow depth of field and beautiful bokeh. Additionally, the lens features an advanced optical design that produces sharp images with minimal distortion throughout the entire zoom range. One of the key features of this lens is its HSM (Hyper Sonic Motor) autofocus system, which provides fast and accurate focusing performance. The lens also has a USB dock that allows for easy firmware updates and customization settings. Additionally, the bundle includes a 64GB SD card, which provides ample storage space for your photos and videos. Overall, this is an excellent choice for photographers who are looking for a high-quality zoom lens with fast autofocus performance and advanced optical design.