Commander Optics HD 420-800mm f/8.3-16 Telephoto Zoom Lens for Pentax K-Series (w/ 2x = 840-1600mm) — 67mm Filter Thread

One year limited Seller Warranty provided by Commander Optics. This HD telephoto zoom covers 420–800mm and, when fitted with the included 2x converter, extends to 840–1600mm (f/8.3–16). Supplied items: the Commander Optics 420-800mm lens, a T‑mount adapter matched to your camera mount, and the 2x teleconverter. The 2X teleconverter doubles the lens’ focal reach. Thread size for filters: 67mm. Compatible with Pentax K-1, K-S2, K-S1, K-500, K-70, K-50, K-30, K5 IIs, K-7, K-5, K-3 II, K-2, K110D and K10D digital SLR cameras.