Rodenstock 240mm f5.6 Sironar-N selected by Sinar (some suggest at stricter tolerances) as indicated by the “Sinar” engraved on the barrel, Multicoated, 72° angle of view, apochromatic, 350mm image circle, Compur Electronic 3 shutter, nice condition, FLAWLESS GLASS, perfect working condition, ships with two caps and retaining ring, this is an exceptional lens at a very attractive price. 

To be clear, this is identical to the Apo-Sironar-N optically and mechanically, the only difference is the branding on the barrel, it is also very similar in sharpness and contrast to the Apo-Sironar-S, it just has slightly less coverage (a little more than 1/2 inch on all sides).