Telescope Filters Guide

 

telescope filters
Orian Nebula Without Ultra High Contrast/Light Pollution Reduction Filter

 

telescope filters
Orian Nebula With Ultra High Contrast/Light Pollution Reduction Filter

If you love the Universe as we do, and already own a telescope, perhaps with the time you have lost some of your enthusiasm. Most likely that’s because you’ve seen all what you have ever dreamed of. If you still didn’t try various filters, then we have good news for you. You can forget everything you have seen until now and rediscover the night sky again. And now – from very new perspective. This time with much more colors, sharpness and contrast. Whether this will be the polar caps of Mars, or some distant nebula, looking through telescopic filters will definitely enhance your midnight experience.

Like photographic filters, these for telescope increase detail and improve contrast. They do it by removing unwanted color of the wavelength of light. let’s have a look to the most popular ones:


 

Light Pollution Filters

The most common “junk” light is the one comes from the city lights. If you are an amateur astronomer and live in a city you probably know what I mean. Unfortunately, light pollution can kill your enthusiasm even if you’re miles away from the downtown.

Fortunately, there are filters that magically will clear the image from light pollution do not cost a fortune, and they gonna make you love your telescope much more!

Order now, and while you are waiting the little thing to get delivered, start getting out the Telescope from the closet. We did research and here are the top five filters removing light pollution on the market  today:

SaleBestseller No. 1
Gosky 1.25 Inch Light Pollution Filter for Telescope
305 Reviews
Gosky 1.25 Inch Light Pollution Filter for Telescope
  • Improve the visibility of deep sky objects by blocking out the mercury vapor, sodium vapor, and other such emission lines from man-made or natural sources which contribute to light pollution
  • Improves contrast on reddish planetary detail. Works well in telescopes of all apertures
  • The filter will fit all standard sized 1.25" eyepieces and accessories. Can be threaded on both sides for stacking with other filters if necessary
  • Comes with sturdy plastic case-proect the eyepiece from dust and moisture
  • Mounted in a nicely anodized housing.
Bestseller No. 2
SVBONY Telescope Filter 1.25 inches UHC Filter Astrophotography to Improve...
297 Reviews
SVBONY Telescope Filter 1.25 inches UHC Filter Astrophotography to Improve...
  • UHC filters or light pollution reduction filters are designed to selectively reduce the transmission of certain wavelengths of light;especially those produced by artificial light
  • Sky background is darker;and contrast of emission nebulae are noticeably improved;the perfect filter for viewing nebula from light polluted skies;or for boosting the contrast of nebula from dark sky sites
  • Due to its ability to produce exceptionally sharp and clear images;this UHC filter is considered one of the most popular astronomy accessories;it can be used not only for celestial observations but also for astrophotography
  • 1.25'' barrel diameter simply attach to eyepiece cased in a sturdy transparent case;standard filter thread for 1.25" eyepieces and other accessories
  • Optical glass lens;aluminum frame;significantly reduces light pollution;great for city and suburban observation
Bestseller No. 3
WEOOEN Light Pollution Filter for Telescope 1.25inch, Metal Frame, Optical...
  • This WEOOEN light pollution filter is a must-have telescope accessory for any astronomy enthusiast. It helps to selectively block the specific wavelengths of light associated with urban sky glow, and enhances the contrast of deep-sky objects. Enable you to see more features of the moon and planets with clarity.
  • This telescope filter is threaded on both sides, can be screwed to most 1.25 inch eyepieces and other accessories that come with threads, like fit for Celestron, Orion, Skywatcher, Meade, William and more. Also, you can stack it with other filters to get a lot of fun
  • Durable Metal Frame for long time use, and optical glass lens offers crisp viewing rather than plastic lens.
  • We provide 1-Year warranty and lifetime maintenance for all of our WEOOEN brand products. If you meet any issues about the product, welcome to share and discuss with us. Our astronomy enthusiasts support team will offer a satisfied solution within 24h.
  • Packaged with a plastic box to protect your astronomy filter from dust and moisture, also it is easy to carry and storage
Bestseller No. 4
SVBONY SV115 Telescope Filter O-III Filter Narrowband Cuts Light Pollution...
12 Reviews
SVBONY SV115 Telescope Filter O-III Filter Narrowband Cuts Light Pollution...
  • The 1.25" O-III filter useful for large aperture telescopes through which the light of the Moon can be extremely overwhelming. Allowing just for the Double Ionized Oxygen lines between 495.9nm to 500.7nm to pass through at 90%
  • Astrophotographic;The filter enhances contrast during visual observation of gaseous and planetary nebulae in all sky conditions; 1.25" filter allows high-contrast imaging even in areas with strong light pollution
  • The filter made from high-grade glass with dichroic interference and antireflection coatings;not only useful at light-polluted sites; the contrast is also increased at dark sky sites;it can be used with all 1.25" eyepieces
  • The O-III filter completely blocks virtually all other visible wavelengths of light so views of nebulas are optimized;increases contrast through selective filtration-Anti-reflection coated to prevent glaring and ghosting
  • Narrowband filter do not eliminate the effects of light pollution or increase the object’s brightness;in many cases, they increase the contrast between nebula and night sky, not brightening the nebula
Bestseller No. 5
ICE 1.25' Telescope Filter Set Variable Polarizing Moon Polarizer & LiPo...
18 Reviews
ICE 1.25" Telescope Filter Set Variable Polarizing Moon Polarizer & LiPo...
  • Filter #1 = 2 piece Variable Polarizer
  • Filter #2 = Lipo Light Reduction Filter
  • All Optical Glass
  • Fits any telescope with a 1.25" eyepiece, including Celestron, Orion, Meade etc.
  • Includes 3 Pocket Storage Wallet

 

Moon Filters

Moon – the closest object to Earth, and why not the most frequently observed is also looking far more beautiful if you see it in details with Polarizing Filters for Observing the Moon. Did’t try yet? Well, believe me, you’ll be surprised how much you missed. Due to the brightness, your pupil shrinks, the less light reaches your eyes. And you know best – less light, less detail!

Information about what makes this type filters can be found in the video below:

Here are top 5 Moon Filters Selling by Amazon

SaleBestseller No. 1
Celestron 1.25' Moon Filter
1,508 Reviews
Celestron 1.25" Moon Filter
  • Reduce glare and increase contrast of the Moon with the Celestron 1.25” Moon Filter
  • Also useful for extra bright planets as well as terrestrial viewing over sand or snow
  • Threads onto most 1.25” eyepieces in seconds
  • Model Number : 94119-A
SaleBestseller No. 2
Celestron 94107 Variable Polarizing Filter 1.25'
153 Reviews
Celestron 94107 Variable Polarizing Filter 1.25"
  • A customizable way to reduce brightness and glare on the brightest celestial objects like the moon, Venus, and bright double stars
  • Adjust the level of light transmission from 1-40% for the best possible view for your specific target and current viewing conditions
  • Simple to use—just rotate filter’s lower ring to adjust brightness
  • Threads onto any Celestron 1.25” eyepiece
Bestseller No. 3
Orion 05662 1.25-Inch 13 Percent Transmission Moon Filter (Black), Single
902 Reviews
Orion 05662 1.25-Inch 13 Percent Transmission Moon Filter (Black), Single
  • The Orion 1.25 inch 13 percent Transmission Moon Filter reduces glare so you can see more lunar detail and surface features with your telescope
  • Metal filter cell threads directly into the 1.25 inch barrel of your telescope eyepiece
  • Especially useful for large aperture telescopes through which the light of the Moon can be extremely overwhelming
  • Telescope eyepiece filter transmits only 13 percent of the incoming light, boosting contrast and ability to discern detail on the Moon
  • Perfectly neutral color will not alter the natural color of the Moon
SaleBestseller No. 4
Moon Filter Set, 1.25'
16 Reviews
Moon Filter Set, 1.25"
  • Four great Moon filters in one kit—everything you’ll ever need for optimal views of the lunar surface
  • Three neutral Density (ND) Filters with different levels of light transmission (13%, 25%, and 50%) allow you to choose the perfect filter for your viewing conditions
  • Moon & Sky glow filter provides high contrast views of the lunar surface and enhances observation of deep sky objects from light Polluted Skies
  • Aluminum filter cells provide a rigid, durable housing for the filter glass and are threaded on top and bottom for stacking
  • Kit Includes a plastic carrying case with moon map and legend for identifying the most popular lunar features
Bestseller No. 5
Gosky Telescope 1.25' Moon & Sky-Glow Filter for Celestron, Orion,...
48 Reviews
Gosky Telescope 1.25" Moon & Sky-Glow Filter for Celestron, Orion,...
  • It is an eyepiece filter for reducing the brightness of the moon and planets and improving contrast.
  • The filter has a mild effect of darkening the background of the night sky so that the fainter objects are more clearly seen contrasted against the blackness of space.
  • 1.25" standard size for Celestron, Orion, Sky-watcher, Meade, William and any brands models.
  • All Study Aluminum Construction and Optical glass filter lens. Standard filter threads on both sides. So you can mount other filters together when using this filter.
  • The filter effectively filters out selective wavelengths of low-pressure sodium and other man-made sources typically used in street lighting. Although it is not a nebula filter, it enhances the views of deep-sky objects by increasing the contrast of these objects against the background sky.

 

Planetary Filters

An important role plays the filters for observations Planets and objects in Deep Space. You might argue about filtering of light – you gave a lot of money for large aperture exactly to gather more light. But in Astronomy not every light is helpful.

telescope filtersCertain wavelengths of light coming from, for example, a nebula, do not contribute to detail. If you remove them, the image that remains is much sharper and have better contrast.

Telescope filters do just that: eliminate light that does not add any detail to the object. What remains is a much cleaner image, that lets you see the finer details with better contrast.


Different objects require different types of filter to see them best.  Jupiter’s Great Red Spot needs a different filter than this for polar regions of Mars or Venus’s clouds. In the chart below you can find the appropriate filters for the various objects and the top 5 Planetary Filter Sets on the market today.

 
 
Bestseller No. 1
Neewer 1.25 inches Telescope Moon Filter, CPL Filter, 5 Color Filters...
743 Reviews
Neewer 1.25 inches Telescope Moon Filter, CPL Filter, 5 Color Filters...
  • PLEASE NOTE: The telescope is not included. Kit includes: (1)Moon and Skyglow Filter; (1)CPL Filter; (5)Color Filters: Red, Orange, Yellow, Green, Blue; Designed to reduce glare and light scattering, increase contrast through selective filtration, increase definition and resolution, reduce irradiation and lessen eye fatigue
  • MOON AND SKYGLOW FILTER: Cuts down glare and brings out much more surface detail and gives you better contrast; It is a multi-band pass filter transmitting a high percentage of light in the visual spectrum; Effectively filters out selective wavelengths of low-pressure sodium and other man-made sources typically used in street lighting
  • CPL FILTER: By utilizing a CPL filter, which filters out scattered light, you are able to cut through those reflections and see the detail behind it; Enhances the contrast of the moon and planets in photographic images
  • STANDARD 1,25-inch THREAD SIZE: 1.25 inches/ 3.17 centimeters thread size, fits for most of telescopes; Color filters have the grooves needed to be softly screwed into the eyepieces lens easily
  • 5 COLOR FILTERS: Includes Red, Orange, Yellow, Green, Blue; Red: Helps make Mercury and Venus stand out from the blue sky when viewed during the day; Orange: Helps increase contrast between light and dark areas, penetrates clouds; Yellow: Helps greatly in viewing Mars by bringing out the polar ice caps; Green: Enhances frost patches, surface fogs, and polar projections on Mars; Blue: Helps split the binary star Antares when at maximum separation
Bestseller No. 2
Zhumell 1.25' Lunar and Planetary Color Filter Set
9 Reviews
Zhumell 1.25" Lunar and Planetary Color Filter Set
  • These filters can be used individually or together to bring out detail in the images you see through your telescope
  • Neutral density filters are useful for splitting binary systems and reducing glare
  • Zhumell filters will fit any standard 1.25" format telescope eyepiece
Bestseller No. 3
SVBONY Telescope Filter 1.25 inches Moon Filter CPL Filter Five Color...
130 Reviews
SVBONY Telescope Filter 1.25 inches Moon Filter CPL Filter Five Color...
  • 7pcs filters set include most popular color planetary and moon telescope eyepiece filters;moon filter;CPL filter;5 color filters with 23A bright red;21 orange;12 yellow;56 bright green;82A bright blue
  • CPL filter is mainly used for elimination of polarized;and enhances the contrast of the moon and planets in photographic images
  • 5 color filters are an essential tool of the lunar and planetary;with red;green;blue;orange and yellow highlight features on Mars;Jupiter;and Saturn
  • High quality aluminum alloy frame and optical glass with standard 1.25” filter threads suitable for 1.25” eyepieces and other accessories
  • Moon and skyglow filter;Cuts down glare and brings out much more surface detail and gives you better contrast; It is a multi-band pass filter transmitting a high percentage of light in the visual spectrum; Effectively filters out selective wavelengths of low-pressure sodium and other man-made sources typically used in street lighting
Bestseller No. 4
Gosky Telescope Filters Set 1.25'' 7 Filters Set for 1.25inch Telescope...
81 Reviews
Gosky Telescope Filters Set 1.25'' 7 Filters Set for 1.25inch Telescope...
  • 7 1.25inch filters for telescopes in a set. Include 1 Crystalview Moon Filter, 1 Polarizing Filter #3, 5 planetary filters: No.56 Green, No.12 Yellow, No 23A Red, No.21 Orange and No.82A Blue.
  • Crystalview Moon Filter-----Enhance Lunar Planetary Views - Eliminating the Street Light Smog.
  • Polarizing Filter #3-----Enhances the contrast of the moon and planets in photographic images.
  • 5 color planetary filters -- The five color filters (Red, Blue, Green, Orange&Yellow) highlight features on Mars, Jupiter, and Saturn.They are an essential tool of the lunar and planetary observer, for filters permit the observation and photography of surface detail that is often virtually invisible without filtration.
  • All filters has M28.5x0.6 1.25inch standand filter thread on both sides. With Metal Frame and Optical Glass.
Bestseller No. 5
Orion 5590 Deluxe Stargazer's 1.25-Inch Eyepiece Filter Set
8 Reviews
Orion 5590 Deluxe Stargazer's 1.25-Inch Eyepiece Filter Set
  • A comprehensive and refreshingly affordable filter set for the best views of all types of celestial objects through 1.25" eyepieces
  • Includes a variable polarizing eyepiece filter for optimal Moon and planetary views
  • Four included color planetary eyepiece filters (#80A medium blue, #25 red, #58 green, and #15 deep yellow) coax out features and details of our neighbors in the solar system
  • SkyGlow broadband light-pollution eyepiece filter helps increase contrast when viewing from light polluted urban and suburban locations
  • Filters are optical glass with anodized aluminum cells. Hard case included

 

Solar Filters for Telescopes

If you are looking to buy a solar filter for your telescope, then let me tell you that it is almost impossible to find the right one for you. The reason is that unlike other filters, solar one does not apply into a standard 1.25 inch eyepiece, but should be put front of the tube, where all light gets in. Now days there is countless types of telescopes in the market with different sizes and solar filter should fit perfectly on your telescope.

Something very important !!!! Never Ever point your telescope to the Sun without sun filter and never look through the eyepiece. You risk losing your eyesight, and damage the telescope.

So, after it became clear that it is difficult to find a ready solar filter for your telescope model, the next thing you can do is to create one. Idid it, and that means everybody can do it too!

telescope solar filters

If you are from those who are not very handy, it means we are much alike. I’m not that “always creating something” person, but my desire to look at the Sun was so big that I couldn’t resist.

For my big surprise making a Sun filter  was not only easy but also very enjoyable work.

After a thorough study on youtube videos I chose the one that most clearly and accurately explain what is needed and what should be done. There it is:

 

 

What you need is:

  • Solar Filter Sheet for Telescopes
  • Pensil 
  • Cardboard
  • Scissors
  • Scotch tape
  • Enthusiasm

The solar sheet can be ordered by the review further down in this page. For my 6 inch telescope, 10 inch square perfectly matched the filter which I made.

Follow the steps in the video and you will succeed. Here are some pictures from my personal experience with the preparation of the filter. And the prize? Well, you will have to look at the Sun with the telescope.

SaleBestseller No. 1
BP-1212 - Silver-Black Polymer Solar Filter Film Sheet (12' x 12') - 1 ea
783 Reviews
BP-1212 - Silver-Black Polymer Solar Filter Film Sheet (12" x 12") - 1 ea
  • Dimensions: 12" X 12"
  • Make your own solar filter for camera, telescope, finder, binocular or handheld eclipse viewer
  • (Size shown in pictures is 8.5" X 11"); Solar image is yellow-orange; Made in USA
  • Black polymer is the most common filtering material for observing sunspots and granulation through telescopes and binoculars; Consistent yellow-orange solar image, even density with any aperture, and flat surface compared to other thin film filters that have wrinkles and creases; (Sheet is shipped in between cardboard and does not include a storage case)
  • REMEMBER, DO NOT VIEW THE SUN THROUGH AN UNPROTECTED FINDER SCOPE. MAKE SURE TO DETACH OR COVER YOUR FINDER SCOPE IF IT IS UNPROTECTED!
Bestseller No. 2
Linear Polarization A4 Sheet Polarizer Educational Physics Polarized Filter...
253 Reviews
Linear Polarization A4 Sheet Polarizer Educational Physics Polarized Filter...
  • High Contrast Linear Polarizing Film
  • High Transmission of Unpolarized Light from 400 – 700nm
  • Excellent Extinction Ratio
  • Available in Various Sheet Sizes for your Customized Use
  • Great for experiments and learning Physics. The sheet is 0.2mm thick and 8.27" X 11.69" (21cm x 29.7cm), IMPORTANT(!) please note that on both sides there is a protective film sheet. You have to remove it gently before use. Once removed, the polarizer sheet will be revealed, clean and smooth.
Bestseller No. 3
Lighting Neutral Density Gels Filter Sheet 16x20 inches Kit, ND3,ND6,ND9...
15 Reviews
Lighting Neutral Density Gels Filter Sheet 16x20 inches Kit, ND3,ND6,ND9...
  • Lighting Neutral Density Gels: Neutral Density gels are used to help change and control the intensity of light. Fit with any light source like strobe,led,flash lights.
  • Premium Transmission Material:This Color Correction Gels are made of smooth and flat polyester film. Stable color temperature and low light loss.
  • Cut as you want: Large Gels filter can be cut or shaped to fit with various light. Use in film, video, photo, stage, theater, holiday party, and DJ lighting, etc.
  • Package Content: (15.7x19.6inches/ 40x50cm) 1x ND3, 1xND6, 1x ND9.
  • Warm tips: Please cold down the light source after a long time use, or it may melt. Use a proper gel holder, or tape the gel to the edges of the barn doors, away from the lamp.

 

 

6 Responses

  • I would love to own a telescope myself. Living in Norway, means not as much light polution as in other places in the world.
    I suppose there is not a one-filter-fits-all-planets filter, but the complete set for different views sounds pretty awesome.

    I am not a handyman either when it comes down making sunlight filters. I am not sure if I would even dare to attempt making such, but it was a clear manual at least.

    Thanks for your review of the lenses. I will bookmark this site, for I should find out more about telescopes before I buy one. I’m not most interested in the sun, but very interested in everything else visible here. Every night I can clearly see the milkyway.
    Got any recommendations regarding a good beginner telescope?

    • Hello Steven.

      Norway is a wonderful country in which, besides the endless night sky, you can also see the northern glow for which I noblely envy you. Unfortunately, light pollution does not depend on the geographical location, but on the size of the city you live in. Larger city – more pollution.

      If you want to get a Тelescope, then here on the site there is a pretty detailed information what you need to know to make a purchase. I have also looked at my favorites of every kind. If you have any questions – I am always here to help.

      Thanks for the comment and good luck!

  • Great post on filters. I love astronomy and do a bit of stargazing myself. I will certainly look to buy a filter after reading your post. I really like the table where it shows what filters to use for what planet. Very informative. I loved your video of polarised light and your images are great. I look forward to more posts from you

    • Hey Harjit 🙂

      Yup, you should definitely try to look with some filter. It’s totally different experience! You can start with that for the Moon. Your eye will appreciate it most and you will be able to see much more details. 

      Cheers 

  • I’ve just gone through your post on filters. Though I’m not astronomy student, yet I love Telescope. And definitely I want to own one. Your write-up is really helpful for mes as I have come to know about filters that are used to observe different planets. Also the video ‘polarised light’ is very impressive.
    Thank you for such great post.

    • Hey Himbru,

      Thanks for the comment! If you have some free time and looking for a new hobby – try Astronomy! Get a Telescope and be inspired every day (actually night, if we have to be more precisely) You gonna Love It. Everyone will! 

      Cheers 🙂

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