The Sigma 100-400mm C is the newest super telephoto zoom lens in the Sigma lineup. With a 4X zoom ratio, this lens is designed for full-frame cameras and offers a lot of reach in a very compact and lightweight package thanks to the variable aperture design. In total specs, features, build, and focal range, it is most closely related to the slightly larger 150-600mm Contemporary lens, and it ships at a slightly lower cost. We are going to do a run through of the shared features and points of differentiation between these two great supertelephoto zoom lenses.