You asked
Best wide angle lens for the olympus om d e m1 mark ii?
For the E-M1 Mark II, I'd start with the Olympus M.Zuiko 7-14mm f/2.8 PRO. It covers 14-28mm full-frame equivalent at a constant f/2.8, which makes it my pick for landscapes, architecture and tight interiors.
If you want a single fast wide prime, the Panasonic Leica DG 9mm f/1.7 frames like 18mm on full frame and gives you more light to work with indoors.
For a slightly less extreme view, the Olympus M.Zuiko 12mm f/2 frames like 24mm and is a good everyday wide.
Written by Claude from this site's pages.