Astronomy Filters

Hard plastic cases protect filters from damage and keep them clean. The die-cut foam mat inside holds each filter securely.

$6.95

Hard Case for Six 1.25" Filters By Orion

Designed to protect your filters from damage and keep them clean, these cases are ideal for single filters or for combining up to six filters into a single, convenient case. The die-cut foam mat inside holds each filter securely. Press-fit lid. Holds any brand of standard 1.25" or 2" filters. Filters sold separately.

$7.95

Series 4000 Photo-Visual Color Filter #47 Violet By Meade

#47 Violet (3% transmission): Strongly rejects red, yellow, and green wavelengths; useful for the study of Martian polar cap regions and for the observation of occasional phenomena in the upper atmosphere of Venus. Enhances contrast between the rings of Saturn. Use only on telescopes of 8" aperture and larger.

$14.95

Series 4000 Photo-Visual Color Filter #56 Light Green By Meade

#56 Light-Green (24% transmission): Is excellent for the observation of Martian polar ice caps as well as yellow-tinted dust storms on the Martian surface. Increases contrast of the red and blue regions in Jupiter's atmosphere as well as in the clould belts. Also useful for enhancing lunar detail.

$14.95

Series 4000 Photo-Visual Color Filter #58 Green By Meade

#58 Green (24% transmission): Use on telescopes 8" aperture and larger to reject blue- and red-toned structures on the surface of Jupiter and thereby increase their contrast relative to lighter parts of the disc. Also use for the enhancement of Saturn’s cloud belts and polar regions. Strongly increases contrast of Mars’ polar ice caps, and increases contrast of atmospheric phenomena on Venus.

$14.95

Series 4000 Photo-Visual Color Filter #82A Light Blue By Meade

#82A Light-Blue (73% transmission): useful on the Moon, Mars, Jupiter, and Saturn. This subtle pale blue filter enhances areas of low contrast while avoiding significant reduciton of overall image brightness. A valuable filter to piggyback with other filters.

$14.95

Series 4000 Photo-Visual Color Filter #11 Yellow-Green By Meade

#11 Yellow-Green Used to enhance planetary features on Mars, Jupiter, and Saturn.

$14.95

Series 4000 Photo-Visual Color Filter #12 Yellow By Meade

#12 Yellow (74% transmission): Contrasts strongly with blue-colored features on Jupiter and Saturn, while enhancing red and orange features. Lightens red-orange features on Mars, while reducing or blocking the transmission, and thereby increasing the contrast, of blue-green areas. Useful in increasing the contrast of lunar features in telescopes 6" aperture and larger.

$14.95

Series 4000 Photo-Visual Color Filter #25A Red By Meade

#25A Red (14% transmission): strongly blocks the transmission of blue and blue-green wavelengths, resulting in very sharply defined contrast between blue tinted cloud formations on Jupiter and the lighter-toned features of the disk. Also useful for the delineation of the Martian polar ice caps and maria. Because of its relatively low total light transmission the #25A filter should be used on telescopes of 8" or larger.

$14.95

Series 4000 Photo-Visual Color Filter #38A Dark Blue By Meade

#38A Dark Blue (17% transmission): Is a popular filter for the study of Jupiter's disk, owing to the filter's strong rejection of orange and red wavelengths. It increases contrast between the reddish belt structures and enhances detail of the Red Spot. Also useful for the study of isolated phenomena, such as dust storms, on Mars, as well as the belt structure of Saturn. Increases contrast of subtle cloud markings on Venus.

$14.95

Series 4000 Moon Filter: ND96 By Meade

Transmits light uniformly across the entire visual spectrum. Reduces glare and increases clarity of the moon in scopes 4" plus. Also useful for splitting double stars when one staris significantly brighter than the other.

$17.00

ND13 Neutral Density Filter 1.25" By Lumicon

ND13, Neutral Density Filter, 1.25". 13% transmission in light. Neutral Density Filters are made from renowned Schott and Hoya optical glass and allow for maximum contrast on viewing planetary and lunar detail. Individually precision ground, highly polished with maximum light transmission coatings on both sides, these filters are 100% guaranteed for life.

$19.95

ND25 Neutral Density Filter 1.25" By Lumicon

ND25, Neutral Density Filter, 1.25". 25% transmission in light. Neutral Density Filters are made from renowned Schott and Hoya optical glass and allow for maximum contrast on viewing planetary and lunar detail. Individually precision ground, highly polished with maximum light transmission coatings on both sides, these filters are 100% guaranteed for life.

$19.95

ND50 Neutral Density Filter 1.25" By Lumicon

ND50, Neutral Density Filter, 1.25". 50% transmission in light. Neutral Density Filters are made from renowned Schott and Hoya optical glass and allow for maximum contrast on viewing planetary and lunar detail. Individually precision ground, highly polished with maximum light transmission coatings on both sides, these filters are 100% guaranteed for life.

$19.95

Neutral-Density Moon Filter 1.25" - 13% Transmission By Orion

The Orion Moon Filter is especially useful to owners of large-aperture scopes, in which the Moon's brightness can be overwhelming. It uniformly reduces light over the entire visible spectrum. Screws into threaded eyepiece barrel.

$19.95

Neutral-Density Moon Filter 1.25" - 25% Transmission By Orion

The Orion Moon Filter is especially useful to owners of large-aperture scopes, in which the Moon's brightness can be overwhelming. It uniformly reduces light over the entire visible spectrum. Screws into threaded eyepiece barrel.

$19.95

43mm PO.75 Ring By Borg

Borg 43mm P0.75 Ring.

$21.00

Neutral-Density Moon Filter 2.0" By Orion

The Orion Moon Filter is especially useful to owners of large-aperture scopes, in which the Moon's brightness can be overwhelming. It uniformly reduces light over the entire visible spectrum. Screws into threaded eyepiece barrel.

$24.95

Eyepiece Filter for White Light Observation By Questar

Eyepiece filter for white light observation

$25.00

Single Polarizer Filter 1.25" By Lumicon

Lumicon Polarizing Filters are manufactured from optically flat Hoya polarized glass. They are the best for cutting all glare and increases contrast on bright celestial objects such as the moon at full illumination, and can be double-stacked with other Lumicon filters for use on bright planets. Suitable for daylight observation of land, sea and nature. Rotating Variable polarizer shown.

$29.95