You asked
Can I use adapted lenses on the om system om 5?
I don't cover lens adapters on the site, so I can't tell you which adapted lenses work well on the OM System OM-5. The OM-5 uses the Micro Four Thirds mount, and the Micro Four Thirds page is the best place to start for what fits natively.
Its full lens list is on the OM-5 page, and it's long. For a sensible everyday kit, I'd look at a standard zoom like the Panasonic Leica DG 12-60mm f/2.8-4, and a fast prime like the Olympus M.Zuiko 25mm f/1.8 for low light. The sensor sizes guide explains why Micro Four Thirds lenses frame wider or tighter than their numbers suggest.
Written by Claude from this site's pages.