1,Interface: Compatible with any telescope with a 1.25 focuser, suitable for wide field lunar observations, medium sized star cluster observations, and various nebula and deep sky object observations when the eye is close to the eyepiece. The eyepiece is equipped with a soft eye guard for comfortable viewing. 2,Focal Length: 4mm or 0.16in focal length telescope eyepiece, providing high magnification for more detailed observations of the lunar surface and other planets, ideal for lunar and planetary observations. 3,Aspheric Lens: Upgraded aspheric lens for improved imaging performance and balanced chromatic aberration correction, resulting in clear images. 4,Optical Glass: Compared to spherical lenses with the same refractive index, the 62 degree aspheric eyepiece is thinner and lighter, specifically designed for planetary observations, and is perfect for observing deep sky objects. 5,Fully Coated Optical Glass: Fully coated optical glass provides excellent image contrast and light transmission, delivering maximum detail and clarity across the entire field of view. Highly chromatic aberration corrected. Planetary filters enhance details of Jupiter, Saturn, Mars, and Venus. 6,Wide Angle: 4mm 62 degree aspheric eyepiece provides maximum detail and clarity across the entire field of view, suitable for landscape observation, bright object observation, and nebula observation. Item Type: 62° Wide Angle Aspheric Eyepiece Weight: 95g or 3.35oz Material: Metal and optical glass Focal Length: 4mm Field of View: 62 degrees Interface Specifications: 1.25in or 31.7mm Thread Specification: M28.6x0.6mm 1 x Eyepiece 1 x Storage Box Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.