Sigma's 80-200mm f/4.5-5.6 was a mid-range telephoto zoom from the manual-focus catalog era, positioned below the faster constant-aperture 80-200mm f/3.5-4 as a lighter, more affordable option for portrait and travel telephoto work.
Covering short to medium telephoto, the maximum aperture falls from f/4.5 at 80mm to f/5.6 at 200mm, with manual focus and zoom control. Sigma made this formula for Canon FD, Nikon F, Pentax K, Minolta MD, Olympus OM, M42, Konica AR and Contax/Yashica mount cameras, using multi-coated elements and a metal mount.
The variable aperture keeps the lens noticeably lighter than constant f/4 rivals, at the cost of a dimmer viewfinder image and slower shutter speeds at 200mm. Optical performance is respectable in the centre through the mid-zoom range, with more softness and vignetting at 200mm wide open.
Widely available secondhand at low prices in most mounts. Buyers should check for oily aperture blades, a common fault after long storage, test that the zoom ring holds its position without creep, and inspect for fungus in the middle elements.