Elcan
Elcan stands for Ernst Leitz Canada. They made special military lenses under the Elcan name.
In Leica M mount there are:
- ELCAN 50mm f/2, for the Leica KE-7a
- ELCAN 66mm f/2
- ELCAN 90mm f/1, apparently without helical, focused by extension rings
In Leicaflex / Leica R mount there are:
- ELCAN-R 75mm f/2
- ELCAN-R 180mm f/3.4
- ELCAN-R 450mm f/5.6