OM mount. Exc condition mount etc - good for parts or fun portrait lens / misty landscapes maybe with the new Retropan 320 Soft you can from Blanco Negro. Focus works perfectly as does the zoom. pics coming soon. I have a mouldy Zuiko 50/1.8 that takes wonderful portraits :-) Comes with correct lens caps. PS these lenses are kept far away from my proper gear - they were a bit mouldy when i bought them anyway.