The ultra-compact Zuiko 25mm f/2.8 prime digital lens is another of Olympus' expanding line of Four Thirds lenses designed specifically for digital photography. This 0.9 inch-thick lens offers a fixed 50mm equivalent (35mm) angle of view, extends less than an inch from the camera body when mounted and weighs just 3.35 oz. It takes 43mm filters and is compatible with Olympus's extension tube and tele converters.