![]() Mars is reddish because its surface absorbs certain wavelengths and more readily reflects those that are more toward the red end of the spectrum. The Moon appears as shades of white, black, and gray based on the reflections from various materials on the surface. They are seen based on reflected light that comes from the sun. Within the solar system, other than the Sun itself, the objects we observe, including the Moon, planets, dwarf planets, comets, asteroids, and planetary moons, are all reflecting objects. I will not be addressing filters used in specially designed, purpose-built telescopes, such as solar telescopes or H-Alpha telescopes.Ĭheck Amazon Price Reflecting Objects vs. Note that I am going to focus on the best telescope filters that can be added to a regular telescope. If you have more than 150 mm of aperture, you should definitely experiment with filters. What are large and small apertures in this context? There are no clear guidelines, but I would say any scope with 80 mm of aperture or more will let you experiment with filters. If your aperture is small, a filter may remove so much light that you see no benefit. ![]() Since filters reduce the light that reaches our eyes, the more aperture your telescope has, the more light it gathers, the more useful filters can be. Telescope filters are typically full-aperture, covering the front of the telescope, or are eyepiece-attached filters that screw onto the eyepiece. ![]() This is done in a variety of ways to suit the specific use case. We are normally trying to capture as much light as possible so we can see the most detail or the dimmest objects. This is the opposite of the way we normally think when it comes to telescopes. However, by reducing the level of light in one part of the light spectrum, the filter may help to bring out another part of the spectrum, which will show us details we might not have otherwise noticed. Filters never increase the amount of light. In simple terms, the filters we use for visual astronomy reduce the amount of light that comes through the eyepiece.
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