M42 Lenses to M43 MFT Lens Mount Adapter K&F Concept M10121 Lens Adapter
SKU: KF06.076
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I have the Nikon F mount version and it works with the GH5. It's all manual focus, of course. There is no lens data transmitted to the camera.
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You'll probably need an OM to M4/3 adapter... https://www.amazon.com/Concept-Mount-Adapter-Olympus-Camera/dp/B01172WA9I/ref=pd_day0_421_14?ie=UTF8&pd_rd_i=B01172WA9I&pd_rd_r=XK8BEYEK4CAAKRNCKJBA&pd_rd_w=L3R2o&pd_rd_wg=OUwIv&psc=1&refRID=XK8BEYEK4CAAKRNCKJBA