Similar in performance to the #11 yellow-green filter, but somewhat less pronounced effect. Its high transmission is a better suited to scopes in the 60mm top 90mm aperture range, while the #11 filter’s transmission is better suited to apertures 3.5” (90mm) to 5” (127mm).
Recommended applications for this filter:
Moon – Improves contrast and reduces irradiation between lunar features of varying brilliance in scopes under 5", especially when combined with a polarizer or neutral density filter. Venus – Occasionally helpful in revealing low-contrast banding in the thick Venusian cloud cover. Mars – Darkens blue and green maria, oases, and canal markings while it lightens the orange-hued desert regions. 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. Saturn – Somewhat useful for darkening atmospheric currents containing low-hue blue tones. 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 enhances comet heads.
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