Rodenstock Sironar-N 210mm f5.6 MC (Large Format, 4x5 Lens) Lens is fully functional ONLY up to shutter speed 1/8, bulb mode works perfectly. Optics are great, see photo for sample shot taken at f16, on a 4x5 field camera. I believe this lens can also serve a 5x7 camera. Note that lens board isn't provided! Please PM me should there be any questions regarding the item.