Amazon.com : OM SYSTEM OLYMPUS M.Zuiko Digital ED 12mm F2.0 Silver For Micro Four Thirds System Camera, Compact Wide Angle lens For Starry Sky and Landscape : Compact System Camera Lenses :
Amazon.com : Rokinon 10mm F2.8 ED AS NCS CS Ultra Wide Angle Lens for Olympus and Panasonic Micro 4/3 (MFT) Mount Digital Cameras (10M-MFT) , Black : Electronics
Best lenses for Micro Four Thirds: Digital Photography Review
Meike 3.5mm F2.8 Wide Angle Fisheye Manual Lens For Olympus Panasonic Lumix Micro 4/3 Mft Mount Gh5 G7 Gx9 Omd Em10 Mark Ii Iii - Camera Lenses - AliExpress