Alexander Smakula started applying hard-coatings to optics at Zeiss in 1935. Smakula used vapor deposition to apply his lens coatings, still in use today. Like most engineers, I'm sure that exact records with Serial numbers were kept- but these are lost to time. What we have left are several of the lenses from this time.
I invite anyone with early lenses made up through 1945 to post images of and with the lens. This may be one of the few places on the Internet that will have this information.
I'm starting with my 1935 Carl Zeiss Jena 5cm F1.5 Sonnar from the 175xxxx batch of lenses. This is also one of the first Sonnars that I bought, and is the first converted to Leica Mount. The front element on this lens is coated. I have worked on one other Sonnar from this same batch that has the exact same coating, and have seen images of a third one.
Wide-Open on the M9,
Wide-Open on the Canon P,

I invite anyone with early lenses made up through 1945 to post images of and with the lens. This may be one of the few places on the Internet that will have this information.
I'm starting with my 1935 Carl Zeiss Jena 5cm F1.5 Sonnar from the 175xxxx batch of lenses. This is also one of the first Sonnars that I bought, and is the first converted to Leica Mount. The front element on this lens is coated. I have worked on one other Sonnar from this same batch that has the exact same coating, and have seen images of a third one.

Wide-Open on the M9,


Wide-Open on the Canon P,
