OM System M.Zuiko Digital ED 50-200mm F2.8 IS PRO Lens

A 100-400mm equivalent range at a constant F2.8, fully weather-sealed, in a lens you can hand-hold all day - OM System states this is the only lens of that description on the market as of September 2025. The optical formula runs 21 elements in 13 groups with two SED, one ED, three E-HR and two HR elements plus an aspherical ED, which is what keeps a zoom of that ratio corrected at full aperture.

In-lens IS is rated at 5.5 stops on its own and 7.0 stops of 5-axis sync IS at 200mm on an OM-1 Mark II. It focuses to 0.78m for 0.5x equivalent magnification at the long end, takes the MC-20 teleconverter for an 800mm equivalent reach, and is IP53 rated dust, splash and freezeproof. 1,075g without the tripod adapter.