SVBONY SV207 1.25 inch Super Plossl 50-Degree Eyepiece Side Extinction Ink Metal 1.25 inch Super Plossl 50-Degree Eyepiece Standard 1.25 Thread 2 Sets of 4-piece Optical Structures Fully Multi-coated Apparent Field of View: 50 Matt Blackened Lens Edge Prevent from Sliding out Standard 1.25 Thread ( M28.5*0.6 ) Threaded specification of M28.5*0.6 standard, supports standard 1.25-inch filter adapter installation. 2 Sets of 4-piece Optical Structures Plossl eyepieces correct color and spherical aberrations very well and provide a flat field, which means the objects that you look at are not fringed in color and distortions will not appear on the edge of the field of view. Fully Multi-coated Fully multi-coated optics, it ensures that each glass surface has multiple layers of coating to for a better image quality. Apparent Field of View: 50 This 50Field of View is wide enough to be generally comfortable viewed and makes this eyepiece ideal for a variety of observational purposes including deep-sky and planetary viewing. Matt Blackened Lens Edge The design improves the efficiency since lesslightis lost due to reflection and improves thecontrastof the image by elimination ofstray light. All-metal mirror structure, fine texture, fine workmanship. Safety Undercut Safety undercut milled into the nosepiece to prevent the eyepiece from falling out of the focuser. With or Without Glasses Plossl eyepieces with 15mm and longer focal lengths are good choices for spectacle wearers but for shorter focal lengths, the SV190 series have greater eye-relief and are better suited. Focal Length 8mm 15mm 25mm 30mm Specifications: