Pentax SMC Pentax-DA 50-200mm f/4-5.6 ED - Pentax KAF Mount

The SMC Pentax-DA 50-200mm f/4-5.6 ED is a compact telephoto zoom lens designed specifically for Pentax APS-C digital SLR cameras. It features Extra-low Dispersion (ED) glass elements to compensate for chromatic aberration and provides a versatile focal range equivalent to 75-300mm in 35mm terms. The lens is notable for its lightweight construction and Quick-Shift focus system, which allows manual focus override while in AF mode. When inspecting a used copy, check the smoothness of the zoom mechanism, as these plastic-barrel lenses can sometimes develop stiff spots. SDS verifies the autofocus motor operation and ensures the rear mount contacts are clean. The front and rear elements should be checked for scratches, and the internal optics for any signs of dust or moisture ingress common in non-sealed consumer zooms.