Artograph Super Prism Projector...The Super Prism features a 3-element, color corrected lens for extra sharp images and increased brightness. Ideal for working from a variety of more challenging originals like photographs, half-tones, and highly detailed drawings. The Super Prism len does not offer a reduction capability, it is designed to enlarge the original from 3 times to 20 times. A separate lens is supplied that will reduce an original from 300% to 80%. Whenever we demonstrate the Prism along with the Super Prism to a prospective customer the most noticeable trait is that both units will easily enlarge a dollar bill but the Super Prism will show the very fine lint fibers in the currency while the Prism will not. Copy size 7" x 7", uses a 3-element lens for extra sharp images and increased brightness. This model uses two 250 watt photo lamps.