Similar in performance to the #8 light yellow filter, but more pronounced effect. Its transmission is somewhat better suited to scopes in the 4” to 8” aperture range, while the #8 filter’s transmission is better suited to apertures 3.5” and below.
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.
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