"The Celestron Observer's Accessory Kit is a great way to expand the functionality and enjoyment of your telescope. Inside the plastic, foam-lined carry case you'll find these accessories: 17 mm Plossl Eyepiece - 1.25"" 6 mm Plossl Eyepiece - 1.25"" 2x Barlow Lens/T-Adapter - 1.25"" #80A Blue Filter - 1.25"" #25 Red Filter - 1.25"" Moon Filter - 1.25"" Microfiber Cleaning Cloth Eyepieces - The 17 mm and 6 mm Plossl eyepieces can be used in any telescope with a 1.25"" focuser. Each eyepiece features a four-element design with a 52deg. apparent field of view. The lenses are fully multi-coated to improve light transmission and protect the optics. The 17 mm Plossl eyepiece offers a nice medium magnification view in most telescopes, and the 6 mm Plossl provides high magnifications, great for the Moon and planets, especially when seeing conditions are good. 2x Barlow Lens/T-Adapter - The included versatile 2x Barlow will double the magnification of any 1.25"" eyepiece. The 17 mm Plossl included in this kit will double in power, effectively becoming a 8.5 mm eyepiece, and the 6 mm will provide the magnification of a 3 mm. Any other 1.25"" eyepieces you already have will also work in this desirable accessory, giving you even more magnification choices. Remember, high magnifications do not always produce clear, sharp results, especially on evenings of poor or moderate seeing conditions. Experiment to find the magnifications|This Celestron eight-piece accessory kit enhances the performance of your telescope|Two high-quality Plossl eyepieces (6mm and 17mm) for high and moderate power viewing|Kodak Wratten #25 and #80A blue 1.25"" eyepiece filters for increasing the contrast of planetary views|Neutral density Moon filter to increase contrast in lunar views by cutting back the birghtness of the image without changing its color|3-in-1 Barlow/T-adapter, which can be used as a visual barlow, a basic T-adapterfor connecting a DSLR camera, and a tele-converter for increasing the focal length of the telescope when attaching a DSLR camera|Microfiber lens cleaning cloth to keep your optics dust-free|Hard plastic carrying case holds all of these accessories with room for more of your own"