#82A Pale blue 1.25" color filter

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With telescopes 5” in aperture and smaller, this #82A pale blue Astro-Tech 1.25” eyepiece filter is a great help in improving the contrast of features on the Moon, and bringing out atmospheric details when viewing Mars, Jupiter, and Saturn . . .

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

Color of the given filter.
82A - Pale Blue
The weight of this product.
1 oz.
1 year
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Astro-Tech - #82A Pale blue 1.25" color filter

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Astro-Tech - #82A Pale blue 1.25" color filter
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Our Product #: ATCF82
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Clear skies,

If you have a scope 5” in aperture or smaller, this Astro-Tech #82A pale blue 1.25” eyepiece filter is very helpful for improving the contrast on lunar features, and helping to bring out features in the atmospheres of Mars, Jupiter, and Saturn . . .

. . . our 38th year