A projection system, comprising: I) a first illumination source for providing a first light beam having a first spectral bandwidth; II) a second illumination source for providing a second light beam having a second spectral bandwidth; III) a first micro-mirror array optical modulator (502, 504, 506) for selectively modulating the first light beam to encode data thereon; IV) a second micro-mirror array optical modulator (502, 504, 506) for selectively modulating the second incident light beam to encode data thereon, wherein each of the first and second micro-mirror array optical modulators are: A) configurable in an ON state, an OFF state and an unpowered state; B) adapted for redirecting light by both diffraction and reflection and for providing an output modulated light beam; the said output modulated light beam comprising a primary diffraction order in the ON state and exhibiting a diffraction handedness dependent at least upon the spectral bandwidth of the light incident thereupon; the diffraction handedness being defined by the relative arrangement of at least the primary order and the dominant secondary orders of the ON state relative to the unpowered state zero order; V) an optical element for collecting the output modulated light beams from both the first micro-mirror array optical modulator and the second micro-mirror array optical modulator, the optical element having: C) at least one colour dependent aperture (400, 600, 700, 800) that defines portions of the output modulated light beams which are transmitted and remaining portions which are blocked, the colour dependent aperture comprising one or more regions of material for absorbing or reflecting a band of light to create a larger or smaller working f-number of the optical element for the band of light; D) spectrally selective light blocking elements (805, 810, 815), comprising dichroic filters or light absorptive filters, applied around the edges of the color dependent aperture to block stray light or light from unwanted diffraction orders. I) a first illumination source for providing a first light beam having a first spectral bandwidth; II) a second illumination source for providing a second light beam having a second spectral bandwidth; III) a first micro-mirror array optical modulator (502, 504, 506) for selectively modulating the first light beam to encode data thereon; IV) a second micro-mirror array optical modulator (502, 504, 506) for selectively modulating the second incident light beam to encode data thereon, wherein each of the first and second micro-mirror array optical modulators are: A) configurable in an ON state, an OFF state and an unpowered state; B) adapted for redirecting light by both diffraction and reflection and for providing an output modulated light beam; the said output modulated light beam comprising a primary diffraction order in the ON state and exhibiting a diffraction handedness dependent at least upon the spectral bandwidth of the light incident thereupon; the diffraction handedness being defined by the relative arrangement of at least the primary order and the dominant secondary orders of the ON state relative to the unpowered state zero order; A) configurable in an ON state, an OFF state and an unpowered state; B) adapted for redirecting light by both diffraction and reflection and for providing an output modulated light beam; the said output modulated light beam comprising a primary diffraction order in the ON state and exhibiting a diffraction handedness dependent at least upon the spectral bandwidth of the light incident thereupon; the diffraction handedness being defined by the relative arrangement of at least the primary order and the dominant secondary orders of the ON state relative to the unpowered state zero order; V) an optical element for collecting the output modulated light beams from both the first micro-mirror array optical modulator and the second micro-mirror array optical modulator, the optical element having: C) at least one colour dependent aperture (400, 600, 700, 800) that defines portions of the output modulated light beams which are transmitted and remaining portions which are blocked, the colour dependent aperture comprising one or more regions of material for absorbing or reflecting a band of light to create a larger or smaller working f-number of the optical element for the band of light; D) spectrally selective light blocking elements (805, 810, 815), comprising dichroic filters or light absorptive filters, applied around the edges of the color dependent aperture to block stray light or light from unwanted diffraction orders. C) at least one colour dependent aperture (400, 600, 700, 800) that defines portions of the output modulated light beams which are transmitted and remaining portions which are blocked, the colour dependent aperture comprising one or more regions of material for absorbing or reflecting a band of light to create a larger or smaller working f-number of the optical element for the band of light; D) spectrally selective light blocking elements (805, 810, 815), comprising dichroic filters or light absorptive filters, applied around the edges of the color dependent aperture to block stray light or light from unwanted diffraction orders.