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Astro-Tech #12 Medium yellow 1.25" color filter

Regular Price: $11.95

Special Price $8.95

Availability: In stock

This #12 medium yellow Astro-Tech 1.25" eyepiece filter is helpful in improving lunar and Martian contrast in telescopes 4" to 8" in aperture, particularly if combined with a polarizing or neutral density filter when used with the larger apertures . . .
Our Product #: ATCF12
 

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 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.
74% transmission

Tech Details

Color 12 - Medium Yellow
Weight 1 oz.
Warranty 1 year

Reviews

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Astro-Tech Filters are a great value! This is a fraction of what you'd pay elsewhere and works just as well.
This filter works well on Mars. Also improves features on Jupiter and Saturn. (Posted on 1/11/2019)
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