You asked
What lenses should I buy for the om system om 3?
For an everyday kit on the OM-3, I'd start with one standard zoom and add a fast prime.
- Olympus M.Zuiko 12-45mm f/4 PRO: about 24-90mm on full frame, a sensible range for most days out.
- Panasonic Leica DG 25mm f/1.4 II: about 50mm equivalent, good for street and low light.
- Olympus M.Zuiko 45mm f/1.8: about 90mm equivalent, a small, inexpensive portrait lens.
If you want a bigger, faster zoom for the same job, look at the OM System M.Zuiko 12-40mm f/2.8 PRO II. It costs more and weighs more. Not sure what the numbers mean? The focal length converter will translate any lens for you.
Written by Claude from this site's pages.