You asked
Is the om system om 5 mark ii good for wildlife?
The OM-5 Mark II is a good choice if you want a small, light, weather-sealed body for wildlife, and its in-body stabilisation helps with handheld telephoto shots. Its 2x crop factor makes long lenses reach far. A 150-600mm lens frames like 300-1200mm on full frame, which is plenty for birds and distant animals.
For a long lens, I'd look at the OM System M.Zuiko 150-600mm f/5-6.3 IS for reach, or the OM System M.Zuiko 100-400mm f/5-6.3 IS II if you want something more manageable. If you're serious about action, the OM System OM-1 Mark II is the wildlife favourite, with a stacked sensor and very good bird detection. For more on the subject, see wildlife and sport.
Written by Claude from this site's pages.