Astro-Tech #12 Medium yellow 1.25" color filter

Recommended applications for this filter:
Moon - Improves contrast between lunar features of varying brilliance in scopes 4" and larger, especially when combined with a polarizer or neutral density filter with scopes in the 6" to 8" aperture range. Venus - Occasionally helpful in revealing low-contrast banding in the thick Venusian cloud cover. Mars - Increases the contrast of polar caps, frost areas, low clouds, and dust storms against the ochre deserts. Also sharpens the boundaries of yellow dust clouds. Jupiter - Somewhat useful for darkening atmospheric currents containing low-hue blue tones and enhancing detail in small orange-red zonal features in the belts. Useful for studies of the polar regions. Saturn - Somewhat useful for darkening atmospheric currents containing low-hue blue tones and enhancing detail in orange-red zonal features in the belts. Improves the visibility of Cassini's Division in the rings. Neptune and Uranus - Somewhat useful for enhancing very subtle dusky features in scopes 10" and larger. Comets - Brings out highlights in yellowish comet dust tails and improves the contrast of comet heads.
74% transmission