- Specifications
- Block diagram
| Marketed | November 1951 |
| Original Price | 26,000 yen |
| Lens Construction (group) | 4 |
| Lens Construction (element) | 6 |
| No. of Diaphragm Blades | 10 |
| Minimum Aperture | 16 |
| Closest Focusing Distance (m) | 1 |
| Maximum Magnification (x) | — |
| Filter Diameter (mm) | 40 |
| Maximum Diameter x Length (mm) | 48 x 36.8 |
| Weight (g) | 270 |
A famous standard lens in the modern optics history, which succeeded in eliminating flare caused by coma, a drawback of Gauss type lenses. Based on the optical theory developed by this lens design, various high performance wide angle and telephoto lenses with large apertures were developed.
