You asked
What lenses should I buy for the om system om 1?
For an everyday kit on the OM-1, I'd start with the OM System M.Zuiko 12-40mm f/2.8 PRO II. It frames like 24-80mm on full frame, and that constant f/2.8 keeps it useful indoors.
Then add one lens for what you shoot most:
- Wide landscapes and architecture: the Olympus M.Zuiko 7-14mm f/2.8 PRO, which frames like 14-28mm.
- Portraits and low light: the Olympus M.Zuiko 25mm f/1.8, a small prime that frames like 50mm.
- Wildlife and sport: the OM System M.Zuiko 50-200mm f/2.8 IS PRO, which frames like 100-400mm.
If you're not sure yet, buy the zoom first and let your shooting tell you what to add. The focal length converter helps if you want to check any other lens against full frame.
Written by Claude from this site's pages.