Sigma 35-70mm f/3.5-4.5 Zoom - Unknown Mount

The Sigma 35-70mm f/3.5-4.5 is a compact, standard zoom lens designed for film SLR cameras. Providing a useful range from wide-angle to a short portrait length, it is a practical choice for everyday shooting where a lightweight setup is preferred. The lens features a relatively modest aperture range, keeping the physical size small, and typically employs a two-ring design for separate control of focus and focal length. Check for smooth rotation in both the focus and zoom rings, as the lubricants in these older Sigma lenses can sometimes dry out and become stiff. SDS examines the optical path for dust and internal marking. It is also important to verify that the aperture blades are clean and respond correctly to the camera's stop-down lever, as oil on the blades can cause exposure inaccuracies.