Sigma 18-35mm f/3.5-4.5 Aspherical AF - unknown Mount

The Sigma 18-35mm f/3.5-4.5 Aspherical AF is a wide-angle zoom lens designed for full-frame and film SLR cameras, providing a useful range for landscapes and architectural photography. On APS-C digital sensors, it offers a focal range equivalent to roughly 27-52mm. The optical design incorporates aspherical elements to reduce distortion, which is often a concern in wide-angle zooms. It is a lightweight and compact alternative to faster, heavier wide-angle zooms of its era. Used units should be checked for zoom smoothness, as the internal cams can occasionally become loose or gritty. SDS performs a thorough check of the autofocus motor to ensure it locks onto subjects correctly without hunting. Given its age, the internal lens elements are inspected for fungal growth and haze. We also check that the aperture responds correctly to camera commands, particularly on older Sigma electronic mounts that may have compatibility issues with newer digital sensors.