I was curious about the Opton as I'd never heard of it. Here is what I found:
"The ownership of the name "(Carl) Zeiss) was disputed after the break up of the firm when the second world war ended and parts of it were moved to the "West" to become Carl Zeiss Oberkochen, and parts of it remained in what then became the GDR.
The name "OPTON" is supposedly taken from *OP*tische Werke *O*berkoche*N*. Though i'm not sure that it really is.