1. An optical lens system having an imaging path, the optical lens system comprising: a relay lens system in the imaging path, the relay lens configured to receive an image data stream, the image data stream comprising a sequence of image frames, the image data stream having an image frame period; a projection lens system in the imaging path, the projection lens system configured to receive the image data stream from the relay lens system; and a dynamic iris in the imaging path, the dynamic iris comprising an aperture having a size, the dynamic iris configured to change the size of the aperture at a rate at least as fast as the image frame period, the dynamic iris further configured to modulate a first image frame in the image data stream, the modulating resulting in a reduction in light transmission associated with the first image frame, wherein the dynamic iris is located within the relay lens system.