Wide angle; 4mm 62 degree aspheric eyepiece can get maximum detail and definition across the entire field of view; Anti-lost design; Eyepiece interface recess portion can prevent the loss;Applicable;watch the scenery;bright celestial observations; nebula and so on. 4mm lens only weighs 0.09lb; For lenses with the same refractive index; the 62 degree aspheric eyepiece is thinner and lighter than the spherical eyepiece;designed primarily for planetary observation;perfect for deep sky objects. Fully coated optics glass eyepieces for excellent image contrast and light transmission;give maximum detail and definition across the entire field of view;highly achromatic;planetary filters enhance details on Jupiter;Saturn;Mars and Venus. Standard 1.25’’ 31.75mm fitting diameter;can be used in any astronomical telescope with a 1.25" focuser;for broad field lunar observations; medium sized star clusters;and a wide range of cloudy nebulas and deep sky targets. Focal length;0.16" 4mm;offer high magnifications;look more closely and more detailed at the moon's surface and other planet; for viewing the moon and planets.

Item Weight: 0.09 Pounds. Finderscope: Reflex. Focus Type: Manual Focus. Product Dimensions: 2.95"D x 1.57"W x 1.57"H. Telescope Mount Description: Fixed Mount. Objective Lens Diameter: 31.7 Millimeters. Eye Piece Lens Description: Kellner. Brand: SVBONY. Country of Origin: China. Manufacturer: SVBONY. Date First Available: July 15, 2016. Is Discontinued By Manufacturer: No. Best Sellers Rank: #4 in Telescope Eyepieces. Customer Reviews: 4.4 out of 5 stars 1,058 ratings 4.4 out of 5 stars. Item model number: FAUF9301AA. : B01J7Z1YV2. Item Weight: 1.44 ounces. Product Dimensions: 2.95 x 1.57 x 1.57 inches.