The Celestron 1.25” Eyepiece and Filter Kit expands the functionality and enjoyment of your telescope. Inside the metal, foam-lined carry case you’ll find these accessories: (32 mm Plossl Eyepiece - 1.25”, 17 mm Plossl Eyepiece - 1.25”, 13 mm Plossl Eyepiece - 1.25”, 8 mm Plossl Eyepiece - 1.25”, 6 mm Plossl Eyepiece - 1.25”, 2X Barlow Lens - 1.25”, 80A Blue Filter - 1.25”, 58 Green Filter - 1.25”, 56 Light Green Filter - 1.25”, 25 Red Filter - 1.25”, 21 Orange Filter - 1.25”, 12 Yellow Filter - 1.25”, Moon Filter - 1.25”) Eyepieces - All five Plossl eyepieces can be used in any telescope with a 1.25” focuser. Each eyepiece features a four-element design with a 52º apparent field of view. The optics are fully multi-coated to improve light transmission and protect the optics. The 32 mm Plossl eyepiece offers a low power, wide field view in most telescopes, the 13 mm and 17 mm focal lengths are medium-power oculars, and the 8 mm and 6 mm eyepieces provide high magnifications for the Moon and planets. 2X Barlow Lens - The included, and versatile 2X Barlow doubles the magnification of any 1.25” eyepiece. Since this kit includes five eyepieces, you will be able to use them with and without the Barlow, giving you a total of ten magnification options in all. Any other 1.25” eyepieces you already have will also work in this 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 that are best for your telescope on a particular night. Filters - Coloured filters can be used to bring out certain details on a planet’s surface or its cloud structure. All of the planetary filters included in the 1.25” Eyepiece and Accessory Kit, as well as the Moon filter, can be used on any 1.25” eyepiece with the proper filter threads. Just screw one onto your eyepiece of choice and slide it into the focuser. The Moon filter helps block out a portion of the light the Moon sends into your eyepiece so that you can see details better. You can also try this filter on Venus; it blocks enough glare so you can observe the planet’s phases more easily. Metal Case: The sturdy metal carry case has die-cut foam inside to protect and cushion your accessories. Store each one in its appointed place when not in use. The case is large enough to carry a few extra accessories too. Just pull out enough of the foam cubes to make a nest for your eyepiece, camera adapter, etc. A tight fit is better, so remove the least amount of foam possible before testing the fit. You can always remove more if you need to.