OMNI 15 MM EYEPIECE 93320-omni-series-125-in-15mm OVERVIEW Omni eyepieces offer a quality 4-element Plossl optical design at a super affordable price.Rubber eyecups provide comfort and increase contrast. Leave them up or fold them down when wearing eyeglasses.Beautiful matte aluminum barrels and blackened lens edges prevent internal reflections.1.25 inch barrels are threaded to accept filters. DESCRIPTION Celestron Omni series eyepieces offer a 50 apparent field of view, perfect for the Moon, planets, and a plethora of deep-sky objects. The premium four-element optical set is finished with multiple layers of high-transmission coatings for clear, sharp images. The edges of the optics are blackened for increased contrast. The Omni eyepiece body is made of aluminum. A two-step anodizing process results in a beautiful matte finish that resists reflections and glare. Each eyepiece in the Omni Series includes a black rubber eyecup. It can be left up or folded down for better observations while wearing eyeglasses. Models with a longer barrel (15 mm, 32 mm, 40 mm) include a rubberized grip for non-slip handling during observing sessions. The insert barrel is threaded to accept 1.25 inch filters. Celestron Omni eyepieces are also available in the following focal lengths in a 1.25 inch format:4 mm, 6 mm, 9 mm, 12 mm, 20 mm, 25 mm, 40 mm,if you need others focal length,pls let us know,we will send you the link to buy. SPECIFICATIONS Focal Length:15 mm (0.59 in)Apparent Field of View:50 Eye Relief (mm):13 mm (0.51 in)Number of Lens Elements:4Barrel Size (in):1.25 in (32 mm)