|Manufacturer:||Carl Zeiss (OPTON)|
|Description:||High resolution lens, once made for micro reproduction. 66x94mm format. Lens design: 8 elements in 6 groups. M58 filter mount.|
OPTON stands for Carl Zeiss and S-Ortho-Pl stands for S-ORTHOPLANAR as Zeiss West was in legal conflict with Zeiss Jena, so the full name could not be used, nor the name ZEISS.
Magnification given is for REVERSED operation. Mounted via thread mount into a special mount for DURST enlargers (see last picture)