An original Duclos Lenses design, the 20mm extension tube allows you to decrease the minimum focus of your PL mount lens to achieve results similar to unique macro lenses. While wide angle lenses benefit most from this product, the Duclos PL Extension Tube can be used on just about any PL mount lens. Decrease the minimum focus distance to within a few inches of the front element while maintaining optimal image quality. Designed and manufactured in the USA by Duclos Lenses, the stainless steel components, precision tolerances, and optically flat internal surface finish are meticulously married to reduce stray light and ensure the highest quality is maintained. Works with S35 and 35FF format lenses and cameras.