Carl Zeiss Touit 12mm F2.8 X-mount. I haven't used it much because I sold my camera shortly after purchasing it. Dust inevitably appears in the product photos, but there are no scratches, and it's almost new. Includes the original hood, caps, and a separately sold original UV filter. The filter was attached immediately after purchase, and it has been stored in a dehumidified storage. The 7th photo shows the lens without the filter.