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:

Bestseller No. 1
Gosky 1.25 Inch Light Pollution Filter for Telescope
168 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
ICE 1.25' LiPo Filter for Telescope Light Pollution Reduction for Night...
26 Reviews
ICE 1.25" LiPo Filter for Telescope Light Pollution Reduction for Night...
  • Reduces Light Pollution for Crystal Clear Night Skies
  • Blocks out skyglow without changing the entire color spectrum
  • Optical Glass Filter
  • Fits any telescope with a 1.25" eyepiece, including Celestron, Orion, Meade etc
  • Includes Plastic Storage Case
Bestseller No. 3
SVBONY Telescope Filter 1.25 inches Moon Filter CPL Filter Five Color...
64 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
SVBONY Telescope Filter 2 inches CLS Filter City Light Pollution Reduction...
61 Reviews
SVBONY Telescope Filter 2 inches CLS Filter City Light Pollution Reduction...
  • Electron beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching;as well as stability on CWL (central wavelength) no deviation affected by temperature change
  • Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass band and Optical density of off-band
  • 90% transmission of main nebula emission lines;such as Ha 656nm;OIII 496nm;500nm;SII672nm and H-beta 486nm
  • 0.1% transmission of off-band;specifically the major emission lines of artificial light pollution;such as Na 589nm;Hg 435nmand 578nm
  • Suitable for color CCD cameras and unmodified DSLR Urban optical filter can effectively suppress urban harmful light and improve the contrast of shooting target
SaleBestseller No. 5
Gosky 2' Light Pollution Filter for Telescope Eyepiece
14 Reviews
Gosky 2" Light Pollution Filter for Telescope Eyepiece
  • 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 2" eyepieces and accessories. Can be threaded on both sides for stacking with other filters if necessary
  • Comes with sturdy case-proect the filter from dust and moisture
  • Mounted in a nicely anodized housing.

 

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

Bestseller No. 1
Celestron 1.25' Moon Filter
993 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
Bestseller No. 2
Neewer 1.25 inches Telescope Moon Filter, CPL Filter, 5 Color Filters...
588 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. 3
1.25' Orion 13% Transmission Moon Filter
700 Reviews
1.25" Orion 13% Transmission Moon Filter
  • The Orion 1.25" 13% 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" 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% 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
Celestron 94105 Neutral Density Moon Filter 1.25', Black
88 Reviews
Celestron 94105 Neutral Density Moon Filter 1.25", Black
  • Reduces brightness and cuts glare, increasing clarity of the moon, Venus, and bright double stars
  • 13% light transmission
  • Provides a true Color image
  • Threads on to any Celestron 1.25” eyepiece
Bestseller No. 5
SVBONY Telescope Filter 1.25 inches Moon Filter CPL Filter Five Color...
64 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

 

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
SVBONY Telescope Filter 1.25 inches Moon Filter CPL Filter Five Color...
64 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. 2
1.25' Orion Basic Set of Four Color Filters
49 Reviews
1.25" Orion Basic Set of Four Color Filters
  • Handy color planetary telescope eyepiece filters help enhance your view of the planets and Moon, unveiling specific features and enabling you to discern more detail
  • High-grade Schott optical glass is vat-dyed for even color coating, then anti-reflection coated for maximum light throughput
  • Anodized aluminum cells are double-threaded to permit filter stacking for multiple filter use
  • Includes #15 Deep Yellow, #25 Red, #58 Green and #80A Medium Blue color filters
  • Each filter has a metal filter cell and is threaded for use with Orion 1.25" telescope eyepieces and filter-threaded accessories
Bestseller No. 3
Neewer 1.25 inches Telescope Moon Filter, CPL Filter, 5 Color Filters...
588 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. 4
Orion 1.25' Premium 20-Piece Color Planetary Filter Set
16 Reviews
Orion 1.25" Premium 20-Piece Color Planetary Filter Set
  • Premium assortment includes 20 of the best 1.25" color filters for planetary viewing
  • Color filters make it easier to see planetary and lunar details
  • Improve contrast of specific planetary and lunar features
  • Includes sturdy metal case with die-cut foam interior for safe storage and transport
  • Quick-reference guide indicates benefits of each filter at-a-glance
Bestseller No. 5
Celestron 94119-10 1.25 " Eyepiece Filter Set
  • Filter set includes #12 Deep Yellow, #21 Orange, #80A Blue and #ND-96-0.3 Neutral Density Filter, 50% transmission
  • Perfect for lunar and planetary observation
  • Reduce glare and light scattering
  • High-quality, solid plane parallel glass
  • Stackable filters for various combinations

 

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.

Bestseller No. 1
BP-1212 - Silver-Black Polymer Solar Filter Film Sheet (12' x 12') - 1 ea
776 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
Transparent Decorative Window Film Anti UV Colorful Adhesive Vinyl Heat...
  • 【HEAT INSULATION and ENERGY SAVING】Privacy window decoration film blocks out 99% of infrared rays and 99% of UV rays reducing fading and aging of interior furnishings. The heat control window film can retain heat in winter and keep it out in summer, reducing expensive heating and cooling costs
  • 【SELF ADHESIVE】Self adhesive film's service life is much longer than the common non-adhesive films in the market, it is easy to install with soapy water in minutes, and easy to remove without any residue left, it can reinforce glass strength. Once the glass is hit by an unexpected impact,it can stick the fragments to some degree and protect your skin from harm
  • 【WIDE USAGE】Decorative transparent window film can be used in building shopping mall glass, home and hotel interior decoration , bar, studio, kindergarten, make the space more artistic. Easily make your own coloured glasses, camera lenses, light filters fit for film, video, photo, stage, theater, party, and DJ lighting; Also great for memory albums scrapbooks and various other art projects
  • 【WARM TIPS】Stick tape on both sides of the window film, and then separate tape. When the tape is separated, the backing transparent protective film can be peeled off
  • 【SHOPPING EXPERIENCE SATISFACTION GUARANTEENS】No matter what questions in using our window films,please feel free to contact us,we will solved your problem within 24 hours, We will always here for you
Bestseller No. 3
Astromania Deluxe Solar Filter 160mm Adjustable Metal Cap for Telescope...
  • A must-have to safely observe the sun without damaging your eyes - optical filter fits snugly over your telescope's aperture to block 99.9% of incoming sunlight.
  • This filter features an inside diameter of 135mm - it is designed to fit optical tubes with an outer diameter of 130mm to 152mm,the outer diameter of filter is 160mm.
  • The solar filter meets ISO 12312-2: 2015 and Amazon has verified the security. Explore the Sun safely through a telescope with this high-quality solar filter featuring Baader AstroSolar film in a sturdy aluminum cell.
  • Three clamping screws with protective plastic caps - ensure a perfect fit and are also gentle on your telescope,attaches directly - filter in anodized aluminium mounting.
  • NOTE: (1)Never Use Your Telescope If The Sun Filter is Any Disrepair, Otherwise Per-manent Eye Damage Will Result.(2)Because of the larger diameter, some solar filters may have wavy line on the film which will not have any effect for observation.

 

 

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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