Eyepiece Color Filters

More Information  · Images of Some Features Price $44.95 List Price $49.95 Weight 4 oz Warranty 2 years

#12 Yellow
Recommended applications for this filter:
Moon – Improves contrast between lunar features of varying brilliance in scopes 6" and larger, 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.
74% transmission

#25A Red
Recommended applications for this filter:
Moon – Somewhat useful for improving contrast between lunar features in scopes 8" and larger. Mercury – Improves observations at twilight, when the planet is near the horizon. Reduces brightness of terrestrial sky to enhance daylight observing. Venus – Reduces brightness of terrestrial sky in daylight observing, allowing occasional terminator deformations to be seen. Mars – Useful for Increasing the contrast and definition of polar caps, frost areas, and maria against the ochre deserts with scopes 8" and larger, particularly when Mars is close to Earth’s horizon, as the red light it passes is the least refracted by air currents in our atmosphere. Jupiter – Very useful in defining blue-tinted cloud formations against lighter-toned atmospheric features. Saturn – Very useful in defining blue-tinted cloud formations and polar regions against the lighter-toned planetary disc. Comets – Enhances the definition of comet dust tails in 10" and larger scopes.
14% transmission

#56 Light Green
Recommended applications for this filter:
Moon – Useful for enhancing the contrast of lunar features in scopes 6" and smaller. Venus – Useful for Venusian cloud pattern studies and to reduce the brightness of the terrestrial sky during daylight observing of Venus (an excellent time to observe this planet, as the high contrast of Venus against the dark night sky often makes for uncomfortable and unsatisfactory observing, while during the day the contrast range is not nearly as great, irradiation within your eye is reduced, and subtle Venusian features are sometimes more visible). Mars – Excellent for increasing contrast of Martian polar caps and surface frosts with scopes 6" and smaller. Jupiter – Increases the visibility of the Great Red Spot (which is more like a Faint Red Spot at the present time) with scopes 6" and smaller. Useful for observing the low-contrast hues of red and blue visible in the Jovian atmosphere. Enhances white features in the planetary atmosphere. Saturn – Enhances white features in the planetary atmosphere.
53% transmission

#ND-6 25% Transmission Neutral Density Filter
This filter reduces irradiation, glare, and brightness in lunar and planetary observing with medium aperture telescopes by allowing only 25% of the light collected by the telescope to reach your eye. Since the light is transmitted through the filter uniformly over the entire spectrum, it is excellent for planetary observing, as the bright planetary discs are dimmed to more comfortable observing levels without altering the colors. In addition, the filter can be piggybacked with color filters to provide both glare reduction and contrast enhancement. The filter also helps split binary stars of greatly differing magnitudes by reducing the glare and diffraction around the brighter star of the pair. This filter works best with 3.5" to 6" aperture scopes, or with larger scopes when piggybacked with color filters.
25% transmission.