Steinheil Orthostigmat 140mm brass lens (Germany, 1898) antique brass lens from the renowned German maker Steinheil, established in Munich in 1854 from 1898 according its serial number engravings: Steinheil Munich Paris Nº 44427 Orthostigmat 1:6,8 F=14cm Bté. S.G.D.G.​ focal length: 140mm diaphragm: f/6.8 iris diaphragm with antique scale marked from "4" height (with lens hood): 45mm frontal diameter (lens hood): 43mm image circle: about 20cm (enough to cover a 5x7" plate with slightly dark corners) image circle has been taken at infinite with full aperture; at close distances and with small apertures, the image circle can increase weight (with lens flange): 165g symmetrical optical design (6 elements, 2 groups), it is a convertible lens: if the the frontal element is unscrewed, the lens gives double focal length and increased coverage good condition glasses: clean and clear, there is no fungus, haze or separation minuscule air bubbles on the glass, as usual on lenses from those times, not affecting performance the diaphragm is clean and free of oil diaphragm ring moves smoothly comes with lens flange shipping method: Post Office or GLS (depending of your country) registered, with track and trace on internet NOTE: USA buyers must add the 15% of the final price as tariff for goods received from European Union. in case you buy 2 or more lots I will combine shipping and will refund you the overpaid postage