You asked
What are the alternatives to the olympus m zuiko 75mm f 1 8?
The site doesn't have a catalogue of other 75mm lenses, so I can only point you in a few directions. The closest in job is the portraits guide. Its 135mm or 70-200mm f/2.8 suggestions cover similar tight framing, and a 75mm on Micro Four Thirds frames roughly like 150mm on full frame, so a 135mm is the nearest full-frame match. If you want the same kind of compression on a different system, the 85mm f/1.8 is the classic full-frame portrait lens.
The two other Olympus M.Zuiko primes I list, the 25mm f/1.8 and the 17mm f/1.8, are much wider, so they suit different subjects. For a sensible general setup, see your first lenses.
Written by Claude from this site's pages.