Sigma 24mm f/2.8 AF - unknown Mount

The Sigma 24mm f/2.8 AF is a compact wide-angle prime lens dating back to the early days of autofocus SLR systems. It features a dedicated aperture ring and a macro capability that allows for a close focusing distance of approximately 18cm. This lens is noted for its high centre sharpness and minimal distortion, making it suitable for landscape and architectural photography on both film and full-frame digital bodies. When inspecting used copies, focus on the mechanical operation of the autofocus screw-drive and the condition of the aperture blades. The external barrel often features Sigma's older 'Zen' matte finish, which is prone to becoming tacky or peeling over time. SDS checks for internal haze and ensures the aperture snaps quickly without oil contamination. Compatibility with modern digital SLR bodies should be verified, as some older Sigma chips may not communicate correctly with newer camera firmware.