Types of Telescope filters

In many different aspects, filters are always useful and essential; water filters of the ponds, so that the fish and seafood that we consume are clean and healthy, to the filters of the water that we drink. Filters are also present in our air conditioning units at home or in our office, and in the face masks that we wear for our protection, to minimize the danger of inhaling toxic air and other harmful elements carried by the air we breathe.

In much modern times, filters have gone beyond these purposes, mainly for health.

Filters are now in many apps that we use on our smartphones and laptops. Functioning more for an aesthetic value, filters are useful image-changing components of a mobile app, such as Facebook, Instagram, Snapchat, Zoom, Google Meet, etc.

When the sun is at its brightest during summer, people prefer using polarized sunglasses to provide better protection for the eyes than using regular sunglasses as they cut down glare and appear to make colors look snappier.

Meanwhile, astronomical filters, such as in scopes, function similarly. The telescope filter is an accessory used by amateur astronomers to enhance the clarity and quality of celestial objects’ details, either for viewing, data gathering or only for photography. On the other hand, research astronomers use various band-pass filters for photometry on telescopes. It obtains measurements that reveal objects’ astrophysical properties, such as stellar classification and celestial body placement on its Wien curve.

Where to Buy
Solomark 1.25 Inch Telescope Moon and Skyglow Filter
Celestron 1.25" Moon Filter
Orion 5659 2-Inch SkyGlow Broadband Eyepiece Filter
Astromania 1.25" IR/UV Blocking Filter
Gosky Telescope Filters Set 1.25'' 7 Filters Set for 1.25inch Telescope Eyepieces


Eyepiece filters are generally available in 1.25 inches and 2 inches, which are usually compatible with most telescopes. You can either pick the Solomark 1.25 Inch Telescope Moon and Skyglow Filter, and the Celestron 1.25″ Moon Filter, or 2 inches filters like Orion 5659 2-InchSkyGlow and the Astromania 1.25″ IR/UV Blocking Filter.

Planetary Color Filters 


Astronomers and backyard observers also acknowledge the benefit of using an array of color eyepiece filters. These color filters help to glean subtle features on the planets. Because the Earth’s atmosphere is continuously unstable, caused by many factors like air currents that blur fine surface detail on the different solar system objects, like planets when viewed through a telescope. Thus, faint, contrasting areas blend due to irradiation, and there is a distortion between light and dark spots. With color-eyepiece filters, such distortions are reduced.

Color filters are a very popular optical accessory, and they come in a wide range of colors that functions accordingly. They help increase contrast and bring out details of the planet or a celestial object you observe as they zero in on a narrow region of the spectrum and reduce the scattering of interfering wavelengths. For example, a #25 eyepiece color filter is best used when observing or taking photos of Mars, which is red. It can dramatically increase detail by reducing the prime hues and exposing hidden contrast and surface markings.


Each color eyepiece filter transmits its distinctive color of light while blocking complementary colors. That is why Mars is most effectively enhanced with a green filter. Green objects will appear bright (pale) through a green filter and dark through a blue or red filter. Red features will appear bright through a red eyepiece filter and dark through a green or blue eyepiece filter.

Listed below are the specific color eyepiece suited for your telescope as you look into the Solar System’s diffently colored planets.


With a #25 red color eyepiece, the planet’s disk will stand out against a blue sky, allowing daytime or twilight viewing. It is best observed right after sunset when the sky is saturated in orange light, using #21 Orange with high magnifications to see the planet’s phases.


Regardless of your telescope’s aperture, Venus’s brightness usually causes a very “overexposed,” roiling image so, use a #47 Violet filter or stacked #58 Green and #80A Medium Blue filters to reduce the harsh brightness.


With the planet’s cloud bands, loops, festoons, ovals, and Red Spot, #80A, #58, and #21 color eyepieces will be excellent to show the planet’s spectacular image. But note that use not more than two bands without a filter, to seven or more with a filter. Try loading filters to reduce the heavy glare.


Using a 15 Deep Yellow, Saturn’s many subtle details are improved and help sharpen Saturn’s image in photographs, improving the Cassini division’s resolution. Additionally, you can compare the difference in brightness of the rings’ extremes with #25, #58, or #80A.