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 or 10mm or 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 x 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: M42x0.75 pitch Total height: 75mm Black color Total weight: approx. 400g Package List: 1 x 4mm Plossla eyepiece 1 x 10mm Plossla eyepiece 1 x Plossl eyepiece 25mm 1 x 2X Barlow Lens The telescope in the photo is a prop.