The lens was designed by the prominent optics constructor Ludwig Bertele, the famous Sonnar's author! This lens is practically a wide angle Sonnar (a 3-element Sonnar... the king of lenses, with the world's best 3D effect)!

Albert Schacht was the operations manager for Carl Zeiss from 1919-1926. From 1939-1946, he was the technical director at Steinheil. Then he founded his own company!

All my items have been professionally checked, cleaned out, repaired and refurbished!

You will get a guaranteed flawless item!

You can be 100% sure, I did everything to provide you with the best possible lens!

I bought and tried at least 30 kinds of greases and oils to find the best!

If needed I disassembled the lens 5-8-10x ... so that I could provide the best possible (clean glasses, perfect working)!

I sell only perfect lenses! This is why I was very disappointed, shocked to see that a rival person (or I dunno what was his motivation) left me a neutral feedback with full of lies! There is no one in the world more straight than me, and I helped people in my whole life, so I won't scam you!