This is an L39 mount. Since there is no category, it is listed as E-mount, but please be careful not to make any mistakes. The lens of Olympus's half-frame camera OLYMPUS PEN EES-2 has been converted to an L39 mount. When using a helicoid adapter such as M-NEX, you can focus as close as about 30 cm. The shape of the aperture is a little strange. The space between the adapter and the lens is not uniform. There may be some dust and minor scratches. This is a modified lens, so please refrain from purchasing if you are concerned about fine details. Please refer to the images. Dust is noticeable when the aperture is stopped down. The product is the lens only. The camera and adapter are not included. You will likely need a mount adapter, so please understand this before purchasing.