Deliver sharp image; Plossl eyepiece; FMC full broadband multilayer coating; made of optical glass lens; perfect for astronomy observation; especially for planetary viewing Standard Plossl eyepiece structure; 2 sets of 4 pieces optical structures; very well made; 48 degrees field of view; wide field of view; 11mm exit pupil Increasing contrast for the viewed object; matt blackened lens edge; edge blackening minimizes internal reflections and reduces glare; the contrast of viewed object can be increased Can be used for a very long time; all metal structure; a rubber anti slip ring design; which keeps the eyepiece securely in your hands; even when it’s cold or you have gloves on Strong compatibility; 1.25 inches connection size; fit for 1.25 inches telescopes and filters When you look through a good eyepiece for the first time you realise that what you’ve been observing for all those years could have looked much clearer. Still looking for a good eyepiece? Come and have a look of this SV131 Plossl eyepiece! FMC coating FMC full broadband multilayer coating, it ensures that each glass surface has multiple layers of coating to for a better image quality.Standard Plossl eyepiece structure: 2 sets of 4 pieces optical structures Matt blackened lens edge The edge of the lens is matt blackened to prevent stray light interference Well made All-metal structure, fine texture, fine workmanship, and humanized environmental protection rubber anti-slip ring design will prevent accidental depression About the size Threaded specification of M28.5*0.6 standard, supports standard 1.25-inch filter adapter installation Specifications: Model: SV131 Eyepiece Type: Plossl Focal length: 17mm Field of View: 48-Degrees Exit Pupil: 11mm Connection size：1.25-inch Field Stop Diameter: 16mm Lens group: 2 Group / 4PCS Lens coated: FMC Side of the lenscoate: Extinction Ink Material: Metal Thread size: M28.5*0.6 Non-slip Cover: Yes Eyecup type: Rubber Net Weight: 71.7 g/2.53oz Dimension:Ø35.5x50mm Package Includes: 1* SV131 1.25" Plossl 17mm Eyepiece 2* Dust Cover