Sigma 17-35mm f/2.8-4 EX Aspherical - unknown Mount

The Sigma 17-35mm f/2.8-4 EX Aspherical is a wide-angle zoom lens designed for full-frame and film SLR cameras. Part of Sigma's professional 'EX' series, it features a fast f/2.8 maximum aperture at the wide end, making it suitable for low-light interiors and landscapes. The lens utilizes aspherical elements to correct for aberrations and distortion across the zoom range. When buying used, be aware that this model was produced in different versions; the earlier version has an 82mm filter thread and a different AF motor compared to the later HSM version. SDS checks for smooth rotation of the large zoom ring and ensures the glass is free from scratches, particularly on the bulbous front element. The matte EX coating should be inspected for signs of peeling or stickiness, a common trait of Sigma lenses from this era.