Opteka 500mm f/6.3 HD Telephoto Mirror 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 High-index / low-dispersion optical glass, fully multi-coated, every element, anti-reflection coating 7 elements in 6 groups Incredibly compact and lightweight Great for the wildlife or nature photographer who wants to be hidden while taking photos of the subject May be combined with the Opteka 2x multiplier for 1000mm (Sold separately - 47st Photo Item Code: B000JSZ41S)