Camera with slow shutter speeds from 1 sec. to 1/20 sec. but no rangefinder. Geared for close-ups, photomicrography, astrophotography and other special applications which required slow shutter speed speeds.
According to Canon records, only 50 were made. Other details and the original price are unknown. Around 1939, Seiki-Kogaku was starting to make its own lenses. It made a prototype, Tessar-type 50mm f/4.5 lens (4 elements in 3 groups) and Sonnar-type 135mm f/4 lens (4 elements in 3 groups) without a rangefinder coupling. 'Serenar' was chosen from among in-company suggestions for the name of the lenses. The name is probably based on the name of a sea on the moon.
It was not until 1947 when the company started making usable lenses for its cameras.
| Shutter | - |
| Viewfinder | - |
| - Magnification | - |
| - Coverage | - |
| Power | - |
| Size | - |
| Weight | -- |