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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. 83% transmission
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Toll-Free Telephone Astronomics: 800-422-7876; Christophers, Ltd.: 800-356-6603 Alternate Telephone: 405-364-0858 24 Hour Fax Line: 405-447-3337
Telephone Hours: Monday 8 AM - 6 PM CST Tuesday-Friday 8 AM - 8 PM CST Saturday Noon - 5 PM CST
Store Hours: Monday-Friday 9 AM - 5 PM CST Saturday Noon - 5 PM CST
Astronomics / Christophers, Ltd. 680 S.W. 24th Ave. Norman, OK, 73069
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