The #21 orange filter blocks blue and green wavelengths, enhancing the details of Jupiter's cloud belts. On Mars, it sharpens the boundary between light and dark areas. #12 yellow filter improves contrast on lunar craters; Mars' surface features, channels, and polar caps become more visible. Jupiter's cloud bands show increased contrast, especially in the blue ammonia cloud regions. #23 red filter blocks most blue and green light, providing high contrast for observing bright details on the cloud surfaces of Jupiter and Saturn. This filter is ideal for studying Mars' polar caps. #82A light blue filter is suitable for observing the Moon, Mars, and Jupiter. It is often used in combination with other filters to improve contrast in darker areas without reducing overall planetary brightness. #56 light green filter enhances the visibility of ice caps and surface features on Mars, especially during dust storms. It also improves contrast of red and blue structures in Jupiter's atmosphere. Violet filters are useful when observing polar regions on Mars and effectively block red, yellow, and green light. With larger telescopes (over 12 inches), they can help reveal subtle atmospheric structures. Color: as shown in picture Material: aluminum alloy + optical glass Size: 13.5 x 7 x 6 cm Package Contents: 1 x #12 Yellow Filter 1 x #21 Orange Filter 1 x #23 Red Filter 1 x #56 Green Filter 1 x #82A Blue Filter 1 x Moon & Sky Glow Filter 1 x aluminum case Only the above package content is included; other items are not part of the package. Note: Lighting and display differences may cause slight variations in the color of the item shown in the image compared to the actual product. Measurement error is +/- 1-3 cm.