A detachable optical structure for a device having one or more cameras , the detachable optical structure comprising: a body having a transparent portion , an optical element attached to the body , wherein the optical element comprises a first aperture , a second aperture and two or more reflective elements (111, 411;112, 412) arranged for parallel displacement of an optical axis from the first aperture to the second aperture , and when the detachable optical structure is applied to the device having one or more cameras , the optical element is configured to be positioned such that the first aperture is aligned with a camera of the device having one or more cameras , and the optical element is at least partially aligned with the transparent portion of the body to allow for light to travel through the second aperture , wherein the optical element is movably attached to the body via a shifting mechanism, wherein the shifting mechanism comprises a rotating disc attached to the body via a pivoting joint , two or more arms attached to the rotating disc via two or more sliding joints, and two or more pivoted joints connecting each of the two or more arms with the optical element ; or wherein the shifting mechanism comprises a plurality of mechanical arms attached to each other in a sequence at each end via floating pivots , wherein the first mechanical arm of the plurality of mechanical arms is attached at a first end to the body via an anchored pivot , and the last mechanical arm of the plurality of mechanical arms is attached to the optical element via a floating pivot ; or wherein the shifting mechanism comprises a ferritic plate rigidly attached to the body , a magnetic element rigidly attached to the optical element and movably attached to the ferritic plate due to the magnetic attraction between the magnetic element and ferritic plate . a body having a transparent portion , an optical element attached to the body , wherein the optical element comprises a first aperture , a second aperture and two or more reflective elements (111, 411;112, 412) arranged for parallel displacement of an optical axis from the first aperture to the second aperture , and when the detachable optical structure is applied to the device having one or more cameras , the optical element is configured to be positioned such that the first aperture is aligned with a camera of the device having one or more cameras , and the optical element is at least partially aligned with the transparent portion of the body to allow for light to travel through the second aperture , wherein the optical element is movably attached to the body via a shifting mechanism, wherein the shifting mechanism comprises a rotating disc attached to the body via a pivoting joint , two or more arms attached to the rotating disc via two or more sliding joints, and two or more pivoted joints connecting each of the two or more arms with the optical element ; or wherein the shifting mechanism comprises a plurality of mechanical arms attached to each other in a sequence at each end via floating pivots , wherein the first mechanical arm of the plurality of mechanical arms is attached at a first end to the body via an anchored pivot , and the last mechanical arm of the plurality of mechanical arms is attached to the optical element via a floating pivot ; or wherein the shifting mechanism comprises a ferritic plate rigidly attached to the body , a magnetic element rigidly attached to the optical element and movably attached to the ferritic plate due to the magnetic attraction between the magnetic element and ferritic plate . <EOS>