|
Celestron Filters |
 |
Eyepiece filters are an
invaluable aid in lunar and planetary observing. They reduce glare and light scattering, increase contrast through selective filtration, increase definition and resolution, reduce irradiation and lessen eye fatigue. |
| Celestron’s filters are made of high quality, solid plane parallel glass with excellent homogeneity. They’re anti-reflection coated to prevent glaring and ghosting. All eyepiece filters are threaded to fit Celestron’s, and most other manufacturer’s, 1¼" eyepieces, and offer a full 26mm clear aperture. | |
| Celestron
filters are mounted in black anodized aluminum cells with the Kodak Wratten Series Number
individually engraved, and come with a plastic case for safe storage. The cells of each
filter are double-threaded, so they can be stacked (piggybacked) in various combinations.
This allows you to create different color combinations and transmission characteristics,
or to have the same color characteristic, but with a lower transmission. When stacking
color filters, the effective transmission of the combination you create is equal to the
product of the spectral transmission of each of the filters used. The effectiveness of the filters depends on several factors, including: the aperture and focal length of the telescope, the magnification being used, and seeing conditions. Following, you’ll find descriptions of all of Celestron’s eyepiece filters and what you can expect from them in different viewing situations. Some of these filters are available individually, and others are available in convenient four filter sets Celestron has put together to affordably expand your range of observing options. You’ll find the information on these filters arranged in the following color categories: Yellow, Orange, Red, Blue, Green and Violet. In each category, the information that applies to all of the filters within that color group is listed, then specific information for each filter is broken out into a separate category, where applicable. This way, you’ll know what to expect from each of Celestron’s color filters. At the same time, you’ll become familiar with the astounding variety of enhancements available through these simple accessories. |
|
| #8 Light Yellow 83% T [Series 4] All observing information for this filter is the same as that given for the #12 and #15 Deep Yellow filters, with the exception of the following: Mars – Improves the Martian maria by reducing scattered light from blue areas, while allowing passage of more green light for studying yellow dust clouds. Comets – Brings out highlights in yellowish dust tails and enhances appearance of comet heads |
||
| #12
Yellow 74% T Series 2 |
Moon – Enhance lunar features. Jupiter – Penetrate and darken atmospheric currents containing low-hue blue tones. Enhance orange and red features of the belts and zones. Useful for studies of the polar regions. Mars – Reduce light from the blue and green areas which darken the maria, oases and canal markings, while lightening the orange-hued desert regions. Also sharpen the boundaries of yellow dust clouds. Neptune – Improve detail in larger telescopes (11" and larger apertures). Saturn – Penetrate and darken atmospheric currents containing low-hue blue tones. Enhance orange and red features of the belts and zones. Uranus – Improve detail in larger telescopes (11" and larger apertures). Venus – Reveal low-contrast surface features. Comets – Enhance definition in comet tails. |
|
| #15 Deep Yellow 67% Series 4 |
||
| #21 Orange 46% T [#94118-05 & Series 1] Moon – Greatly enhances lunar features. Jupiter – Improves appearance and detail revealed in structure of Jovian belts. Enhances viewing of festoons and polar regions. Mars – Reduces light from the blue and green areas which darken the maria, oases and canal markings, while lightening the orange-hued desert regions. Also sharpens the boundaries of yellow dust clouds. Mercury –Reduces the brightness of blue sky during daylight observing, to reveal surface features. Saturn – Improves structure of the Saturnian bands and highlights blue polar regions. Venus – Use during daylight observing to reduce brightness of blue sky. Comets – Enhances definition of comet dust tails and heads in larger telescopes (11" and greater aperture). Solar – When using a Celestron Mylar Solar Filter, adding this orange filter will give true color rendition. |
||
| #23A Light Red 25% T [Series 3] All observing information for this filter is the same as that given for the #25 filter, with the exception of the following: Mars – Reduces light from blue and green areas which darkens the maria, oases and canal markings, while lightening the orange-hued desert regions. Sharpens the boundaries of yellow dust clouds. Comets – Improves definition of comet dust tails. |
||
| #25 Red 14% T [#94118-07 & Series 2] Moon – Improves lunar features. Jupiter – Useful for studying bluer clouds. Mars – Ideal for observation of the polar ice caps and features on the Martian surface. Sharpens the boundaries of yellow dust clouds. Mercury – Improves observation at twilight, when the planet is near the horizon. During daylight, it reduces the brightness of the blue sky to enhance surface features. Saturn – Useful for studying bluer clouds. Venus – Use during daylight observing to reduce brightness of blue sky. Occasionally deformations of the terminator are visible. |
||
| #80A Light Blue 30% T
[#94118-12 & Series 1] #82A Pale Blue 73% T [Series 4] #38A Blue 17% T [Series 3] Moon – Enhance lunar detail. Jupiter
– Enhance the boundaries between the reddish belts and adjacent bright zones. Useful
for viewing the Great Red Spot. Mars – Very useful during
the violet clearing. Helpful in studying surface features and polar caps. Mercury
– Improve observation of dusky surface markings at twilight, when the planet is near
the horizon. Saturn – Enhance low-contrast features between
the belts and zones. Venus – Useful for increased contrast
of dark shadings in upper Venusian clouds. Comets – Bring
out the best definition in comet gas tails. |
||
| #47 Violet 3% T [Series 4] Mars – Useful for detecting high clouds and haze over the Martian polar caps. Very useful during the violet clearing. Mercury – Helpful in detecting faint features. Saturn – Good for ring structure studies. Venus – Increases contrast of dark shading in upper Venusian clouds. Comets – Useful for observing brighter comets. |
||
| #56
Light Green 53% T Series 2 |
Moon–
Enhances lunar features. Jupiter – Increases visibility of
the Great Red Spot. Useful for observing the low-contrast hues of blue and red that exist
in the Jovian atmosphere. Mars – Excellent for increased
contrast of Martian polar caps, low clouds and yellowish dust storms. Venus
– Useful for Venusian cloud pattern studies. Reduces brightness of blue sky during
daylight observing. All observing information for
this filter is the same as that given for the #56 Green filter, with the exception of the
following: Saturn – Enhances white features in the
Saturnian atmosphere. Comets – Useful for observing
brighter comets. |
|
| #58
Green 24% T Series 3 |
||
| #96ND Moon Filter #96ND 50% T – Density 0.3 [Series 3] #96ND 25% T – Density 0.6 [#94118-15 & Series 2] #96ND 13% T – Density 0.9 [#94118-16 & Series 1] Moon – Excellent for reducing irradiation, glare and subject brightness. Colors are unaltered, as light is transmitted uniformly over the entire spectrum. Each model performs somewhat differently, depending on the brightness of the moon. Planets – Stacking in combination with color filters lowers transmission, but retains true color balance for specific applications. Reduces glare on brighter planets and minimizes irradiation. Binary Stars – Helpful in splitting binary stars, because it reduces glare and diffraction effects around the brighter star of the binary pair. |
||
| Polarizing [#94118-17 & Series 1] Reduces reflected polarized light in the earth’s atmosphere. Moon
& Planets – Invaluable in reducing irradiation and glare. Binary
Stars – Helpful in splitting binary stars, because it reduces glare and
diffraction effects around the brighter star of the binary pair. |
 |
Seasonal
Star Chart This star finder is best designed for night time, and outdoor use. Major stars are printed in luminous ink which glows in the dark. More than 1000 stars and deep sky objects are listed and charted. Seasonal Star Chart has information on various types of galaxies and nebulae. 20pgs. ITEM# MSD-T-2090 $19.95 |
| Orders: 1-800-701-STAR or Order Online |  |