An electronic device comprising a housing, a folded light ray path imaging system arranged within said housing, and a light ray path entrance aperture arranged within a wall of said housing, said folded light ray path imaging system comprising a first lens arrangement, a light ray path folding structure, and an image sensor, said folding structure comprising a reflection passage, a center axis of said reflection passage extending between a first end of said folding structure and a second end of said folding structure, a plane of said folding structure at said first end and a plane of said folding structure at said second end extending at acute angles (α) to said center axis, a light ray path being folded at least once within said reflection passage by means of at least one reflective surface extending in parallel with said center axis; said folding structure comprising at least two prisms or mirrors separated by air gaps, each prism comprising at least one reflective inner surface; a plane of said entrance aperture being arranged at an acute angle to the plane of said folding structure at said first end; said first lens arrangement being arranged at the first end of said folding structure and in parallel with said plane of said folding structure at said first end; said image sensor being arranged at the second end of said folding structure and in parallel with said plane of said folding structure at said second end; said light ray path travelling through said first lens arrangement and said first end of said folding structure into the reflection passage of said folding structure; said light ray path exiting said reflection passage through said second end of said folding structure and reaching said image sensor; said folded light ray path imaging system further comprising an external prism directing said light ray path into said first lens arrangement; and said external prism being a half-penta prism. said folded light ray path imaging system comprising a first lens arrangement, a light ray path folding structure, and an image sensor, said folding structure comprising a reflection passage, a center axis of said reflection passage extending between a first end of said folding structure and a second end of said folding structure, a plane of said folding structure at said first end and a plane of said folding structure at said second end extending at acute angles (α) to said center axis, a light ray path being folded at least once within said reflection passage by means of at least one reflective surface extending in parallel with said center axis; said folding structure comprising at least two prisms or mirrors separated by air gaps, each prism comprising at least one reflective inner surface; a plane of said entrance aperture being arranged at an acute angle to the plane of said folding structure at said first end; said first lens arrangement being arranged at the first end of said folding structure and in parallel with said plane of said folding structure at said first end; said image sensor being arranged at the second end of said folding structure and in parallel with said plane of said folding structure at said second end; said light ray path travelling through said first lens arrangement and said first end of said folding structure into the reflection passage of said folding structure; said light ray path exiting said reflection passage through said second end of said folding structure and reaching said image sensor; said folded light ray path imaging system further comprising an external prism directing said light ray path into said first lens arrangement; and said external prism being a half-penta prism.