Astromania Fully Multi-coated 1.25" Untra-Wide 80 Degree Eyepiece For Telescope - F11mm. 100% Brand New and High Quality. Multi-Coated 1.25" 80 degree F11mm UWA telescope eyepiece, packed in a protective plastic case. Barrel Size: 1.25" (31.7mm). This superb ultra wide angle eyepiece has 80 degree field of view. 5-Elements in 3 Groups Design. Fully multi-coated, soft eyecup. The inside of the adapter is fully threaded to minimize reflections. Threaded for filters and Barlow lens: 1.25-inch standard female thread to fit a filter etc at the rear end, very well built. Focal Length: 11mm; Eye Relief: 14 mm; Design: 5-Elements in 3 Groups; Coating: Fully coated Broadband Green Film; Color: Ultra black design.