Olympus M.Zuiko Digital ED 9mm f/8 Fisheye Body Cap Lens - Micro Four Thirds Mount

This ultra-slim fisheye lens for Micro Four Thirds cameras serves as both a body cap and a functional optic. It features a fixed f/8 aperture and a 140-degree angle of view, utilising five elements in four groups including two aspherical elements. The manual focus lever offers three positions: deep focus, close-up, and a closed position to protect the glass. It is particularly suited for casual snapshots, street photography, and capturing expansive landscapes where a lightweight setup is prioritised. When purchasing a used example, inspect the rear mounting flange for plastic wear, as the entire construction is polycarbonate. Ensure the sliding focus/protective lever clicks firmly into each of its three positions and isn't loose. SDS checks the internal glass for scratches or dust ingress, though the simple design is generally robust. The fixed aperture means there are no diaphragm blades to fail, but the front element is exposed, so check for cleaning marks.