You asked
Best wide angle lens for the olympus om d e m10 mark iv?
For the E-M10 Mark IV, which has a 2.0 crop factor, I'd start with the Olympus M.Zuiko 7-14mm f/2.8 PRO. It covers 14-28mm full-frame equivalent and keeps a bright f/2.8 aperture across the zoom, so it's the one I'd reach for first. If you'd rather have a cheaper zoom, the Panasonic Lumix G 7-14mm f/4 gives the same range with a slower aperture.
For a prime, the Panasonic Leica DG 9mm f/1.7 frames like 18mm and is a good everyday wide. The Olympus M.Zuiko 12mm f/2 gives a 24mm view in a compact package.
Not sure how these translate? Check the focal length converter.
Written by Claude from this site's pages.