Amazon.com : 420-800mm f / 8.3-16 Manual Super MFT Telephoto Zoom Lens + T2-M4/3 Lens Adapter for Panasonic GH3 GH4 GH5 GH5s Olympus E-PM1 E-PM2 E-PL1 E-PL2 E-PL3 E-M10 Mark II III
Amazon.com : Pentax 100mm f/2.8 WR D FA smc Macro Lens for Pentax Digital SLR Cameras : Camera Lenses : Electronics
Amazon.com : 420‑800mm F8.3-16 Super Telephoto Lens,Manual Focusing Zoom Lens Telephoto Telescope,Alloy + Optical Glass Lens,for Pentax PK Mount Camera Body : Electronics
Amazon.com : Telephoto Lens, 420‑800 mm F8.3‑16 Manual Focusing Zoom Telephoto Lens Camera Lens T2 Mount for Canon EF S Mount Camera(White) : Electronics
Amazon.com : HD PENTAX-D FA 70-210mm F4ED SDM WR: Telephoto zoom lens for DSLR cameras High-performance while maintaing constant f/4 aperture Weather-resistant construction min. focusing distance of 0.95 meters : Electronics
Amazon.com : Foto4easy 420-800mm F/8.3-16 Telephoto Zoom Lens with 2 X Teleconverter Lens and T2/T to Pentax PK Mount Adapter Ring for Pentax K-5 K-7 K3 K-1 K50 K3 K10D K20D K200D
Amazon.com : Commander Optics 650-1300mm (w/ 2x- 1300-2600mm) f/8-16 HD Telephoto Zoom Lens for 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
Amazon.com : 420‑800mm F8.3-16 Super Telephoto Lens,Manual Focusing Zoom Lens Telephoto Telescope,Alloy + Optical Glass Lens,for Pentax PK Mount Camera Body : Electronics
Amazon.com : Foto4easy 420-800mm F/8.3-16 Telephoto Zoom Lens with 2 X Teleconverter Lens and T2/T to Pentax PK Mount Adapter Ring for Pentax K-5 K-7 K3 K-1 K50 K3 K10D K20D K200D
Amazon.com : Commander Optics Super 650-1300mm f/8 Manual Telephoto Zoom Lens for Olympus/Panasonic Lumix Micro Four Thirds Mirrorless Digital Cameras with T-Mount + Photo Essential Accessory Kit : Electronics
Amazon.com : Hersmay 420-800mm f/8.3-16 Tele Zoom Lens Telephoto Zoom Lens Vario Lens for Canon EOS 1300D,200D,2000D,77D,G7 X Mark II,80D, 1200D, 1100D, 750D, 5D Mark III, IV DSLR Camera : Electronics
Amazon.com : Manual Focus High Power 1000mm Lens for Pentax (for All 'K' Series Camera) : Electronics
Amazon.com : FocusFoto 420-800mm F/8.3-16 Super Telephoto Zoom Lens Manual Focus with 3pcs Free T-Mount Adapters for Canon Nikon Sony DSLR Cameras : Electronics
Amazon.com : Foto4easy 420-800mm F/8.3-16 Telephoto Zoom Lens with 2 X Teleconverter Lens and T2/T to Pentax PK Mount Adapter Ring for Pentax K-5 K-7 K3 K-1 K50 K3 K10D K20D K200D
Amazon.com : Vbestlife High-Power 420mm/800mm F/8.3-16 Manual Telephoto Zoom Lens for Canon//Minolta/Nikon/Pentax/Olympus and Other DSLR Cameras. : Electronics
Amazon.com : 500mm f/8-32 HD Preset Telephoto Lens for Olympus OM-D E-M1, E-M5, E-M10, Pen-F E-PL8, PL7, P5, PL5, PM2, P1, P2, PL1, PL1s and PL2 Micro Four Thirds Digital Cameras :