I haven't even taken it out of the box. Leica Summicron-M f2/50mm Black 11826, current model. Purchased from Camera Mitsuba (https://www.camera3ba.jp). The product is unregistered. Regarding the mount, it's a required field, but since there's no Leica M mount option, I've selected "Sigma SA mount." This is for the Leica M mount. This lens features a well-established optical design, a compact size, and a standard focal length with a natural angle of view. Furthermore, it offers a balance of high performance, large aperture, small size, and light weight, making it ideal as a standard lens. It allows for excellent contrast from the wide-open aperture, and high image quality is achieved even at the edges of the frame. The change in contrast is minimal even when stopped down to F2.8 or F4, so you can take beautiful photos even at the widest aperture. Distortion is also reduced to a level that is hardly noticeable. I will cover the shipping fee of 770 yen. Focal length...19-70mm Maximum aperture...1.5-2 Focal length...19-70mm Maximum aperture...1.5-2 Other features...Includes rear lens cap, includes front lens cap