The box says its a 135mm Telephoto lens made by Sears. It also says "Canon C-Mount". This doesn't look like the c-mounts I see on ebay and easily adapted to m4/3 cameras. Any ideas? Also, there's a locking ring closest to the mount. When a small pin is pushed in, the ring rotates. In this state the aperture adjustment is fully manual. Turn it back and allow the pin and ring to fall back into a locked position and the aperture is fully open at all times.