An unusual project for a camera with 2 film cartridges put forward by Evgeniy Bogdanov in mid-1970s.
The name Zorki-Sensation was essentially a code name for the project with a single possible prototype constructed.
The camera body was made out of two parts - front which had shutter and lens mount and back that was rotating with 2 loaded films.
Each film compartment part had its own mechanisms of film rewind, film counter and an ISO setting knobs. Because of the rotating back part, the rangefinder had to be exended dramatically from the body.
1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125, 1/250, 1/500 s and B
Shutter type: curtain
Source: KMZ - http://www.zenitcamera.com/archive/zorki-sensation/index.html