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- Specifications
- Block diagram
| Marketed | October 1951 |
| Original Price | 27,000 yen |
| Lens Construction (group) | 4 |
| Lens Construction (element) | 6 |
| No. of Diaphragm Blades | 6 |
| Minimum Aperture | 22 |
| Closest Focusing Distance (m) | 1 |
| Maximum Magnification (x) | — |
| Filter Diameter (mm) | 34 |
| Maximum Diameter x Length (mm) | 48 x 18.5 |
| Weight (g) | 145 |
A Gauss type wide angle lens with 6 elements in 4 groups. This lens was the fastest wide angle lens in the world at the time. This lens was very popular because it was five times faster than Tessar 28mm f/8, made by Carl Zeiss, Germany. This series of lenses were named “Serenar” by a Canon employee in an in-house naming contest. The word “Serenar” was coined from “Serene”, the name of the sea on the moon (the Sea of Serenity) and an adjective meaning of “tranquil”.
