Function: 1 . Multi-layer coating for the best image. 2. All-metal soft rubber eye shield. 3. The inside of the adapter is fully threaded to minimize reflections. 4. Comes with 3 eyepieces providing low, medium and high magnification for viewing a wide range of objects. (Moon, planets or land) 5. Focal length: 4mm 10mm 25mm Specification: This four-piece 1.25" Astronomy Accessory Kit allows you to get the most out of your telescope and increase its performance. Includes 4mm/10mm/25mm Plossl eyepiece, 2x Barlow lens with T adapter. Plossl Glasses Set: Multi-layer coating for the best image. All-metal soft rubber eye shield. The inside of the adapter is fully threaded to minimize reflections. Comes with 3 eyepieces that provide low, medium and high magnification for viewing a wide range of objects. (Moon, planets or land) Focal length: 4mm 10mm 25mm Thread pitch: M28.5 * 0.6 (for standard 1.25 inch filters) Barlow lens: Doubles the magnification of each inserted 1.25 inch eyepiece Prime focus T type adapter for attaching DSLR cameras. Tele-extender for increasing the focal length of the telescope when attaching a DSLR With T2 M42x0.75 threads, you can attach a T-ring for astronomy photography Barrel size: 1.25 inches Magnification factor: 2X Lens material: clear optical glass lens Lens Coating: Multi-layer HD broadband green film Sleeve material: metal Thread: M42*0.75 pitch Total height: 75mm Black color Total weight: approx. 400g Package List: 1 * 4mm Plossla eyepiece 1 * 10mm Plossla eyepiece 1 * Plossl eyepiece 25mm 1 * 2X Barlow Lens The telescope in the photo is a prop.