Features: brand new and high quality 4mm 62 degree wide angle aspheric eyepiece can get maximum detail and definition across the entire field of view. For lenses with the same refractive index; the 62 degree aspheric eyepiece is thinner and lighter than the spherical eyepiece. Offer high magnifications;look more closely and more detailed at the moon's surface and other planet; for viewing the moon and planets. Optics glass eyepieces for excellent for image contrast and light transmission;give maximum detail and definition across the entire field of view. Standard 1.25''/31.75mm fitting diameter, can be used in most astronomical telescopes with a 1.25" focuser. Specifications: Material: Optical Glass+Acrylic+Aluminum Focal Length: 4mm Field of View: 62 Degrees Interface Specification: 1.25 inches/31.7mm Thread Specification: M28.6x0.6mm Package Includes: 1x Eyepiece Lens 1x Dust Cover note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.