#21 Orange - The orange filter blocks blue and green wavelengths; it sharpens boundaries between orange and greenish areas; #12 Yellow - The yellow filter improves contrast on Moon craters; on Mars; channels and polar caps become more apparent
#25 Red - The red filter blocks blue and green light nearly in total; for instance; between bluish toned structures and the brighter details on Jupiter's and Saturne's clouded surface; however; this filter is mainly used to observe Martian polar caps
#82A Light blue - The light blue filter is suitable for Moon; Mars; Jupiter and Saturne observation; it improves contrast on faint areas without affecting the planet's brightness; which is why this filter is often used in combination with others
#56 Light green - The light green filter is ideal for observing the ice caps on Mars and the yellowish sand storms on the Martian surface; it also improves the contrast of reddish and bluish structures in Jupiter's atmosphere
#47 Violet - The violet filter totally blocks red; yellow and green light; which is useful when observing the polar regions on Mars; with larger telescopes ">12inch"; it also allows to distinguish some structures in Venus' atmosphere
