Olympus budget telephoto kit zoom, tiny, cheap, and optically basic.
The Olympus M.Zuiko Digital ED 40-150mm f/4-5.6 R is the entry-level telephoto zoom for Micro Four Thirds, launched in 2010. Covering an 80-300mm equivalent range, it was designed to pair with Olympus PEN and OM-D bodies as an affordable telephoto option. The R designation indicates a redesigned version of the original.
Optical quality is basic but adequate for casual use. Centre sharpness is acceptable but corners are soft especially at the long end. There is no image stabilisation so it relies on the body's IBIS. Autofocus is driven by the body's contrast-detect system and is adequate but not fast. Build is entirely plastic and very lightweight.
Micro Four Thirds mount only, 58mm filter thread. Not to be confused with the 40-150mm f/2.8 PRO which is a completely different and far superior lens. The R version replaced the original 40-150mm f/4-5.6 without the R designation.
Very cheap used. At this price there is little to worry about. Check that the body communicates with the lens through the electronic contacts and the zoom ring is smooth. For a meaningful upgrade the Panasonic 45-150mm f/4-5.6 offers OIS which this lens lacks.