The invention relates to a device including a color separation prism, comprising at least two image sensors whose sensor surfaces are substantially of the shape of a rectangular parallelogram, and a color separation prism whose front surface of a functional part is planar and substantially of the shape of a rectangular parallelogram, whereby the front surface of the functional part of the color separation prism has a first side length and a second side length perpendicular thereto. In the device of the invention, the first side length of the front surface of the functional part of the color separation prism is substantially shorter than the second side length.