More Information Price $44.95 List Price $49.95 Weight 4 oz Warranty 2 years

#8 Light Yellow
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

#47 Violet
Recommended applications for this filter:
Mercury – May improve observations of rarely visible faint surface features with scopes 8” and larger. Venus – Increases contrast of occasional faint dark shadings in the upper cloud deck. Mars – Useful for detecting high clouds and haze over the polar caps with 8” or larger scopes, particularly during the still-unexplained phenomenon of violet clearing (when the Martian atmosphere – normally a bright, featureless disc in violet light due to the scattering of short wavelengths of light by the thin atmosphere – becomes transparent through a violet or blue filter, revealing large dark surface features). Jupiter – Primarily used for enhancing the boundaries between the reddish belts and adjacent bright zones in the upper atmosphere . Helpful in defining the Great Red Spot and festoons in the belts with scopes 8” and larger. Saturn – Good for enhancing the ring structure with 8” or larger scopes. Comets – Useful for observing brighter comets with scopes 8” and larger.
3% transmission

#82A Light Blue
Recommended applications for this filter:
Moon – Very useful as a contrast-enhancing lunar filter under dark sky conditions with scopes 5” and smaller. Also very useful with scopes 6” and larger when combined with a polarizing or neutral density filter. Mercury – May improve observations of rarely visible dusky surface features at twilight, when the planet is near the horizon. Venus – Increases contrast of occasional faint dark shadings in upper Venusian clouds. Mars – Useful for enhancing the visibility of surface features and localized dust storms, clouds, and ice fogs with 5” and smaller scopes, particularly during the still-unexplained phenomenon of violet clearing (when the Martian atmosphere – normally a bright, featureless disc in violet light due to the scattering of short wavelengths of light by the thin atmosphere – becomes transparent through a violet or blue filter, revealing large dark surface features). Jupiter – Primarily used for enhancing the boundaries between the reddish belts and adjacent bright zones in the upper atmosphere with 5” and smaller scopes. Helpful in defining the Great Red Spot (which is more like a Faint Pink Spot at the present). Saturn – Brings out some low-contrast details in the belts, zones, and polar regions of the planetary disc with smaller scopes. Comets – Brings out the best highlights in comet gas tails in scopes 5” and smaller.
73% transmission

#ND-9 13% Transmission Neutral Density Filter
This filter reduces irradiation, glare, and brightness in lunar and planetary observing with large telescopes by allowing only 13% 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 telescopes 6” to 8” in aperture and larger.
13% transmission.