Opteka 420-800mm f8.3 Telephoto Lens for Panasonic Lumix DMC G9, GH5, GX850, G85, GX8, G7, GM5, GH4, GX7, GH3, GH1, Olympus PEN E-PL7, P5, PL5, PM2, PL1, PL2 Micro Four Thirds Digital Cameras Newly improved 2017, manual focus, digitally-optimized telephoto zoom lens Super zoom 420-800mm focal length HD, super multicoated glass optics for the sharper images 4 Elements in 2 groups Rotating tripod mount