The Sigma 18-35mm f/1.8 DC HSM lens is built for APS-C format cameras, providing a 27-52.5mm equivalent full frame field of view. At 1.78 lbs, the lens is not quite a bear; however, you’ll definitely notice an increase and size and weight from other variable aperture zoom lenses built for APS-C cameras (e.g., Canon’s EF-S 18-135mm IS STM and Nikon’s 18-105mm VR). I equate the feel close to the Canon EF 24-105mm f/4L IS lens. [Read more…]