Barrel size and compatibility 1.25 inch standard eyepiece barrel fits a wide range of telescopes and is compatible with common astronomical observing equipment. Optical design and field of view 20mm wideangle eyepiece with a wide field of view, designed for expansive views of the night sky and broad star fields. Target users Suitable for Astronomical enthusiasts, birdwatchers, students, and researchers who require a reliable wideangle eyepiece. Practical use and versatility When used in astronomy table setups, nature preservation activities, or outdoor expeditions, this eyepiece makes celestial viewing more accessible and enjoyable. Use scenarios Scenario 1: At an astronomy table or club night, mount this eyepiece on a compatible telescope to demonstrate widefield views of star clusters and nebulas. Scenario 2: During field birdwatching or nature observation, use the wide field of view to scan large sky areas and spot celestial events or flight patterns of birds. Scenario 3: In classroom or field research settings, employ the eyepiece for educational demonstrations or observational projects that require a broad sky view. Key attributes Function: Eyepiece designed for astronomical observation with a wideangle field of view. Compatibility: 1.25 inch barrel fits a wide range of standard telescopes. Size and focal length: 20mm focal length, wideangle design for broad sky coverage. Performance: Enables expansive viewing of the night sky with a single eyepiece solution. Applications: Suitable for home observing, educational use, field work, and outdoor observation.