Pentax HD D FA 70-210mm f/4 ED SDM WR - Pentax KAF4 Mount

This HD D FA 70-210mm f/4 is a modern telephoto zoom designed for full-frame Pentax DSLRs, though it remains compatible with APS-C models. It features a constant f/4 maximum aperture, weather-resistant (WR) construction, and a Supersonic Direct-drive Motor (SDM) for quiet autofocus. The HD coating reduces flare and ghosting, while the ED elements minimise chromatic aberration. Prospective buyers should ensure the SDM autofocus motor operates smoothly and silently, as these can be sensitive to lack of use. The weather seals should be intact, and the lens barrel should show no significant play. SDS verifies the electronic diaphragm (KAF4 mount) functions correctly with compatible modern Pentax digital bodies.