Astromania Fully Multi-coated 2 Ultra-Wide 80 Degree Eyepiece For Telescope - F15mm 100% Brand New and High Quality Multi-Coated 2 80 degree F15mm UWA telescope eyepiece packed in a protective plastic case Barrel Size: 2 This superb ultra wide angle eyepiece has 80 degree field of view 6-Elements in 4 Groups Design Fully multi-coated soft eyecup The inside of the adapter is fully threaded to minimize reflections Threaded for filters and Barlow lens: 2-inch standard female thread to fit a filter etc at the rear end very well built Focal Length: 15mm; Eye Relief: 20 mm; Design: 6-Elements in 4 Groups; Coating: Fully coated Broadband Green Film; Color: Ultra black design