13 years later, OM System weather seals its pocket-sized prime lenses –and makes its 100-400mm even more of a monster

Composite image of M.Zuiko 17mm f/1.8 II, 25mm f/1.8 II and 100-400mm f/5.6-6.3 IS II lenses.

If you're a longtime Olympus and OM shooter, today is a day to celebrate; 17 years after the launch of the 25mm f/1.8, and 13 years after the release of the 17mm f/1.8, both pocket-sized prime lenses are now weather-sealed. On top of that, the 100-400mm zoom just got next-level sealing and sync stabilization abilities.

Just announced are the OM System M.Zuiko 25mm f/1.8 II – a classic "nifty fifty" with an equivalent 50mm focal length in full frame terms – and the OM System M.Zuiko 17mm f/1.8 II – a 35mm equivalent street and reportage lens.