B074T1WHLG Opteka 500mm/1000mm f/8 Manual Telephoto Lens for Panasonic Lumix DMC GH5, GM5, GH4, GX850, GM1, G85, GX85, GX8, GX7, GF6, G7, G6, GH3 G1, GH1, GF1, G10, G2 GH2 and GF2 Digital Cameras

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Newest version achromatic refractor 500mm f/8 lens in T-mount
2x Teleconverter doubles the power of your lens to 1000mm.
High index, low-dispersion multi-coated HD optical glass to reduce flare
Built-in tripod collar for improved lens balance
Kit includes 500mm super telephoto preset lens, 2x doubler, t-mount, UV filter, lens hood, lens pen, air blower, dust brush, empty spray bottle, 3×5″ lens tissues (50), standard microfiber (2), large microfiber