Optical system, electronic device, camera, method and computer program

An electronic device comprising:

• a first image sensor;
• a second image sensor;
• an optical system including a first lens placed before the first image sensor, a second lens placed before the second image sensor, and a beam-splitter;
• a housing including the first image sensor, the second image sensor, and the optical system, wherein
• the first lens and the second lens have a coincident optical axis at a side of the beam-splitter which receives incident light from a light entrance in the housing,
• an optical axis of the first lens is folded by less than or equal to 90 degrees by a surface of the beam-splitter,
• the beam-splitter is placed adjacent to the light entrance in the housing, and the incident light first hits the beam-splitter when the incident light enters the housing from the light entrance,
• the light entrance is extending parallel to a wall of the housing,
• the second lens and the second image sensor are extending parallel to the light entrance, and
• the first lens and the first image sensor are tilted with respect to the coincident optical axis.