this is owing in part to the fact that by design these prior systems present a pair of images to the detector focal plane array which contain a substantial amount of parallax generated differentiation from which the stereoscopic perspective is inferred the present disclosure provides an arrangement which permits spectral and optical modification of two sub beams 112 114 yet presents both sub beams to the focal plane array 105 with substantially eliminated parallax error between the two presented images the present disclosure provides an optical arrangement which may be placed between the objective lens and the object for any imaging system thereby producing on the detecting elements of the imaging system a pair of images that are substantially identical as used here a u201c spectral band u201d refers to a limited range of wavelengths in accordance with the present disclosure an imaging system images in two different spectral bands a light beam traveling on a light path from a target the imaging system may consist of a focal plane array receiving a transmitted beam from an objective lens arrangement preceding the lens arrangement a preceding fore optics may be used to generate two sub beams which are imaged into two different and independent locations at the sensor located at the focal plane of the objective lens referring now to fig1 in operation of the system 100 the primary beam 102 from the subject 104 impinges first on a dichroic filter element 108 this element transmits light in the transmission band which is defined by the nature of the dichroic spectral response at the angle of incidence of the primary beam in the example displayed the dichroic element would reflect 95 of the incident light within the spectral band required for sub beam 112.