The Baader Hyperion 13 mm 68° 1.25"/2" Eyepiece is a high-quality eyepiece designed for use with refractor telescopes. this fully multi-coated eyepiece offers sharp and clear viewing experiences. The 1.25"/2" inch diameter makes it compatible with all telescopes, and its unique 68° field of view allows for a wide and detailed viewing experience. The Baader brand ensures excellent performance and reliability, making this eyepiece a valuable addition to any telescope setup.