Astro-Tech #11 Yellow-green 1.25" color filter

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$11.95

Availability: More on the way

This #11 yellow-green Astro-Tech 1.25" eyepiece filter is helpful in improving lunar and Martian contrast in telescopes 3.5" to 5" in aperture . . .
Our Product #: ATCF11
 

Product Description

Similar in performance to the #8 light yellow filter, but more pronounced effect. Its transmission is somewhat better suited to scopes in the 3.5" to 5" 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 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 - 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.
78% transmission

Tech Details

Color 11 - Yellow-Green
Weight 1 oz.
Warranty 2 years

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