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Carl Zeiss Jena is a branch of the legendary Carl Zeiss Company. The brand was established after World War II when Jena remained on the side of East Germany and the well-known ZEISS brand wanted to be used in West Germany as well. The company manufactured a wide range of optics: from camera lenses to microscopes, industrial optics and optical equipment for the military. Frame types varied over the years: older frames were chromed. The latest classic Carl Zeiss Jena lenses were produced with aluminum bodies, with red or green markings. Optically, the quality of Jena lenses was excellent. Mechanically, it has been said that the quality varied more.
| Manufacturer | Whitepoint |
| Series | ZEISS |
| Model | Jena MC Biometar |
| Focal Length | 120mm |
| Max Aperture | T2.9 |
| Min Aperture | T22 |
| Format | - |
| Image Circle | ⌀ |
| Minimum Focus | 3ft 6in |
| Focus Rotation | 280-300° |
| Iris Blades | - |
| Optical Design | - |
| Squeeze | - |
| Front Diameter | 110mm |
| Filter Thread | - |
| Focus/Zoom Rod | - |
| Native Mount | PL, LPL, EF |
| Data Protocol | - |
| Length | 195mm |
| Weight | 2080g |
| Body Telescope | - |
| Body Material | - |
| Focus Drive | - |
| Iris Drive | - |
| Zoom Drive | - |
Country of Origin: -
Release Date: -
Launch Price: -
Design Revisions:
This section restricted to Duclos Staff users.
Service Manual: (Insert link to manual here)
Full CLA: #hrs.
Enter relevant notes here
Lost Motion/Image Shift: #hrs.
The most common issue with Whitepoint lenses are the weak cam followers (small, rounded, thin-walled delrin) wearing out very easily. Their handmade springs can also be an issue due to compressing more easily than the hardened springs like what Cooke uses. Remove the front engraved ring via the x4 T6 screws, then remove the focus scale by warming it up and sliding it off (held on by glue, with tape underneath to make fit tighter.)
…end of Staff section