For added magnification on your Prism Projector, add our Super Prism Lens to achieve 20x the enlargement. This lens offers a 3-element, color-corrected lens for sharper images and increased brightness. The Super Lens enlarges originals from 3 to 20 times. This lens offers a 3-element, color-corrected lens for sharper images and increased brightness. To achieve 20X enlargement with the Super Lens on the Prism projector, the projector should be placed 16.5 feet from the projection surface. An approximate rule of thumb is every 9.5 inches away from the projection surface equals a 1X enlargement. A dark room is required for maximum visibility.Details:Black3.75" x 3.75" x 6"Three element color corrected lens ideal for half-tonesPrecision ground for projecting bright sharp imagesEnlarges image from 3x to 20x the original sizeFor use with Prism Projector (sold separately)