B079C5N26H Opteka 500mm f/6.3 (with 2X- 1000mm) Telephoto Mirror Lens for Panasonic DMC GH5, GH4, GH3, GH2, GH1, GX850, GX85, G85, GX8, GX7, GX1, GF8, GF7, GF6, GM5, GM1, G10, G9, G7, G6, G5 Digital Camera

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ADVANCED OPTICS: Featuring an optimized design, this lens uses mirrors and a series of 7 optical glass elements in 6 groups to reduce chromatic and spherical aberrations. A anti-reflective coating suppresses lens flare and ghosting for increased contrast and color fidelity.
SUPER ZOOM: Manual focus 500mm or 1000mm with the 2x converter, this lens is not only a superb long range choice, but also performs well in a variety of scenes from sports and surveillance to everyday shooting.
SOLID CONSTRUCTION: Full metal body and rear mount allow this lens to withstand wear and tear much better than plastic lenses while commanding a rugged, solid feel when using.
COMPACT AND LIGHTWEIGHT: Mirrors allows this lens to be much shorter than it would need to be without the mirrors. At 4.7-inches long, this 500mm f/6.3 is one of the shortest telephoto lenses currently available.
COMPATIBILITY: Can be used on all Panasonic APS-C and full frame cameras including GH5, GH4, GH3, GH2, GH1, GX850, GX85, G85, GX8, GX7, GX1, GF8, GF7, GF6, GF5, GF3, GF2, GF1, GM5, GM1, G10, G9, G7, G6, G5, G3, G2, G1, L10 and L1.