Olympus PRO fisheye for MFT — same as OM System ID 573, f/1.8 with weather sealing.
The Olympus M.Zuiko Digital ED 8mm f/1.8 Fisheye PRO is the original Olympus-branded version of what is now the OM System 8mm f/1.8 PRO Fisheye. It provides 180-degree diagonal fisheye coverage on Micro Four Thirds with the fastest fisheye aperture available at f/1.8.
Optically excellent — sharp from wide open with minimal chromatic aberration for a fisheye. The fast f/1.8 aperture makes it uniquely suited to astrophotography on Micro Four Thirds, compensating for the smaller sensor with more light-gathering capability than any competing fisheye.
Micro Four Thirds mount with no front filter thread — bulbous front element with built-in hood. 315g. Full weather sealing and freeze-proofing to -10°C. MSC motor for fast quiet AF. Minimum focus distance at the front element — essentially touching distance.
Available used at professional prices. Functionally identical to the OM System rebrand. Check for scratches on the bulbous front element — it is very exposed. A specialist lens with a devoted following among astrophotographers and creative shooters in the MFT system.