Sigma 75-200mm f/3.8 AF Zoom - Unknown Mount

The Sigma 75-200mm f/3.8 is a relatively fast telephoto zoom from the early autofocus era. Its constant f/3.8 aperture provides a brighter viewfinder image and slightly better low-light performance than the more common f/4.5 or f/5.6 alternatives. It typically features a robust metal construction and a dedicated focus ring, suitable for early AF film cameras or adapted use on modern mirrorless systems. The internal AF motors in these early Sigma lenses can be noisy and slower than modern equivalents. When buying used, it is essential to check the AF/MF switch and the internal gears for any slipping or grinding sounds. SDS checks for haze or fungus, which can occasionally develop in lenses of this age, and ensures the constant aperture remains snappy and free from oil.