Fotodiox Fotodiox Pro Excell+1 Lens Adapter w/ Focal Reducing Light Gathering Optics - OM Lens to MFT Camera Fotodiox Pro Premium Grade "No Play" Adapter Top Notch Craftsmanship, Infinity Focus Guaranteed Modifies existing camera crop factor by 0.72x Light gathering optics gain 1-stop of speed 24-Month Manufacturer Warranty