Based on the Canonet 28, this camera was made for Bell & Howell which was Canon’s distributor in America at the time. The camera had Bell & Howell’s needle-aligning delta rangefinder which employed a triangulation system. The lens was then focused by aligning another needle at the moving needle’s position. It was a simple rangefinder system.

Since the rangefinder used a triangulation system, it was called a delta rangefinder.