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Style: EyePiece Filter Set - 1.25 inch (21, 80A, 15, Polarizing) Colored filters can be used to bring out details on a planets surface or its cloud structure. All of the planetary filters included in the lunar and planetary filter set can be used on any 1.25 eyepiece with the proper filter threads, so they are very versatile. Just screw one onto the eyepiece of choice and slide it into the focuser. This filter set includes the following colors: 12 deep yellow - A good general purpose filter for smaller aperture telescopes (less than 4.5 ), The #12 Yellow will improve the contrast of features on the Moon. It will also help you see the equatorial belts on Jupiter and Saturn, clouds and the Polar ice caps on Mars, and the dusky detail on Uranus and Neptune. 21 orange - sharpens the boundaries along the plains of Mars due to the reduction of blue/green transmissions. Use on Jupiter and Saturn to enhance detail in the belts and Polar regions. 80A Blue - enhances the contrast of the Cloud belts on Jupiter and the Polar ice caps on Saturn. It also can be used to increase contrast on the Moon If you dont mind the color shift. Including-96-03 neutral Density - A great filter for the moon, and for stacking with other planetary filters to increase Density without changing the color. A Neutral Density filter is also useful when splitting binary Star systems (double stars). use anytime you want to decrease brightness but dont want to affect the color characteristics of an object. Each 1.25 filter has 26 mm of clear Aperture, and is mounted in a black anodized aluminum cell that is threaded on both sides. Double threads allow the user to stack different filters together to create a custom color or affect the transmission percentage. Special coatings on each filter protect against reflections, ghosting, and scratches. A plastic case is included to keep your filters safe when not in use. From the ManufacturerEyepiece filters are an invaluable aid in lunar and planetary observing. They reduce glare and light scattering, increase contrast through selective filtration, increase definition and resolution, reduce irradiation and lessen eye fatigue. 's filters are made of high quality, solid plane parallel glass with excellent homogeneity. They're anti-reflection coated to prevent glaring and ghosting. All eyepiece filters are threaded to fit 's, and most other manufacturer's, 1.25 inch eyepieces, and offer a full 26 mm clear aperture. color filters are mounted in black anodized aluminum cells with the Kodak Wratten Series Number individually engraved, and come available in 4 assorted kits packed in plastic cases. The cells of each filter are double-threaded, so they can be stacked (piggybacked) in various combinations. This allows you to create different color combinations and transmission characteristics, or to have the same color characteristic, but with a lower transmission. When stacking color filters, the effective transmission of the combination you create is equal to the product of the spectral transmission of each of the filters used. The effectiveness of the filters depends on several factors, including: the aperture and focal length of the telescope, the magnification being used, and seeing conditions.