Isco (Iosef Schneider Optik) was founded in 1936 in Göttingen, Germany. It is a maker of lenses and high precision optical systems.
Before World War II, ISCO manufactured Schneider lenses, such as the Xenon 125/2 fitted in German aerial cameras.
After World War II it specialised in cinema projection lenses, but in the 1950s supplied lenses for several types and brands of German cameras such as Apparate & Kamerabau, Balda, Bilora, Franka, Wirgin (and others). Camera lens type names of Isco were Isco-Mat, Iscotar, Isconar, Tele-Iscaron, Westar, Westanar, Westron, and Westromat.
In addition it manufactured a ranged of M39 and M42 lenses.
In 2009 its name was changed to Schneider Kreuznach Isco Division GmbH & Co. KG

ISCO GÖTTINGEN

In 1913, Joseph Schneider (1855-1933), born in Kreuznach, Germany, founded the "Optische Anstalt Jos. Schneider & Co." Known today as Schneider-Kreuznach or Schneider Optics, the company has been designing and manufacturing high quality lenses for over eighty-six years. During this time, over 14 million precision Schneider lenses have been sold worldwide. 

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SCHNEIDER ISCO4all