These are the best Olympus lenses for underwater photography when you want dramatic wide scenes, true 1:1 macro, and fast, reliable autofocus inside a compact housing-and-port system. For reefscapes, wrecks, and close-focus wide angle (CFWA), the M.Zuiko Digital ED 8mm f/1.8 Fisheye PRO (16mm equiv.) is the hero: bright for dim depths, razor-fast AF for darting fish, and spectacular corner sharpness behind a dome port when you get close and fill the frame; its sealed build shrugs off deck spray while your housing handles pressure. If you prefer rectilinear lines for wreck interiors and kelp corridors, the M.Zuiko Digital ED 7–14mm f/2.8 PRO (14–28mm equiv.) delivers clean edges and low coma behind an appropriately sized dome, with a constant f/2.8 to keep ISOs sane; the filter-friendly M.Zuiko Digital ED 8–25mm f/4 PRO (16–50mm equiv.) adds travel flexibility—wide reef vistas at 8mm, then a quick zoom for fish portraits—when paired with zoom and focus gears. Lightweight kits can lean on the M.Zuiko Digital ED 9–18mm f/4–5.6 (18–36mm equiv.), which plays nicely with smaller domes for nimble currents and tighter budgets. Macro is where Micro Four Thirds shines: the M.Zuiko Digital ED 60mm f/2.8 Macro (120mm equiv.) is the nudibranch/shrimp staple—true 1:1, long working distance for skittish critters, crisp contrast, and fast, accurate AF through a flat port; add a wet diopter for super-macro detail on rhinophores and shrimp eggs. When you need even more reach and stabilization, the M.Zuiko Digital ED 90mm f/3.5 Macro IS PRO (180mm equiv.) brings Sync IS, exquisite optics, and ample working room for wary gobies and blennies—pair it with strong wet diopters and a sturdy focus light for tiny subjects in surge. For fish portraits, medium macro, and lower-viz water, the compact M.Zuiko Digital ED 30mm f/3.5 Macro (60mm equiv.) focuses extremely close and is forgiving to compose in tight spaces. Versatile zooms support mixed dives: the M.Zuiko Digital ED 12–40mm f/2.8 PRO II (24–80mm equiv.) is a favorite under flat ports when combined with wet wide converters for big scenes or clip-on diopters for detail, letting you cover turtles, schools, and coral textures on one tank; the featherweight M.Zuiko Digital ED 12–45mm f/4 PRO (24–90mm equiv.) delivers similar flexibility with smaller rigs, silent MSC AF for clean video, and close-focus for food-chain details. Across these lenses, ZERO coatings help control flare from the sunball and strobe reflections, rounded diaphragms keep background bokeh creamy in super-macro, and internal focusing maintains balance for smooth tracking in surge. Pair any glass with OM-1/OM-5 strengths—class-leading IBIS for steadier handheld clips, AF subject detection that holds on fish eyes, Live ND for silky surge over reefs, Pro Capture for precise feeding strikes—and you’ll surface with more keepers. Practical setup tips: use dome ports for fisheye/ultra-wide (get close to cut backscatter), flat ports for macro (maximize magnification), and wet optics to switch tasks mid-dive; set focus limiters to reduce hunting, bring a bright focus light, and consider disabling stabilization on locked-down tripod macro shots. Whether you’re squeezing through a wreck at 7mm, framing a turtle at arm’s length with a fisheye dome, or stacking diopters on a 60/90mm for tiny nudis, the best Olympus lenses for underwater photography combine fast AF, macro prowess, and dome-friendly wide coverage—delivering color-rich files and edge-to-edge sharpness in rigs small enough to travel anywhere.