Goerz red dot Apochromat Artar 30 inch f/12.5 lens in an Ilex No. 5 Universal shutter mounted on a 5.5" lens board with a Grimes flange. The glass is very clear and clean with no fungus, haze, fog or scuffs. The shutter has flash sync and fires at all speeds and seems on the mark. The aperture control works correctly and the blades look great. These are very sharp lenses that at infinity will cover up to 30" so they are suitable for very large format cameras. Like almost all lenses it is at its best in the middle of it's F stop range (f/22, f/32)