Kiera Jefferson
Light pollution is a common issue for astrophotographers and low-light photographers alike. Light pollution filters can help to reduce the unwanted effects of artificial light sources, such as street lamps and city lights, which can often interfere with the quality of images. The best light pollution filter for your needs will depend on your equipment and the type of lighting in your area. This article will explore the different types of light pollution filters available and provide guidance on choosing the right filter for your setup.
| Characteristics | Values |
|---|---|
| Purpose | To reduce light pollution in astrophotography and nightscape photography |
| Function | Blocks specific parts of the wavelength, cutting out yellow and orange light between 575nm and 600nm |
| Effect | Reduces or eliminates the yellow/orange tint caused by light pollution, increases image contrast, enhances red and magenta tones |
| Types | Broadband light pollution filters, ultra-high contrast or narrowband OIII filters, dual bandpass narrowband filters |
| Examples | Optolong L-eXtreme, Kase's 'Neutral Night', NEEWER Natural Light Filter, Urth Neutral Night Plus, K&F Concept Natural Light Pollution Filter, Lumicon's UHC Filter, Orion UltraBlock Narrowband Filter, Baader Light Pollution Filter |
| Considerations | Effectiveness depends on the type of camera and lighting, some filters have additional features like anti-reflective coatings |
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What You'll Learn
Light pollution filters for astrophotography
Light pollution filters are an essential tool for astrophotographers, helping to mitigate the negative effects of artificial lighting that obscures the night sky. These filters selectively block certain wavelengths of light associated with urban light pollution while allowing important wavelengths, such as those emitted by stars, nebulae, and galaxies, to pass through.
There are various types of light pollution filters available, including those that can be screwed to the front of your lens, slid into a filter holder, or clipped inside the camera. Some filters require a telescope to be installed. Reputable companies that produce light pollution filters for telescopes include Astronomik, Optolong, SkyTech, Apertura, Askar, Celestron, DwarfLab, and Vaonis. Optolong, in particular, is known for producing high-quality filters for astrophotography.
When using a camera lens, it can be more challenging to find a compatible filter as most astronomy filters are designed for telescope equipment. In this case, a clip-in sensor that attaches inside your camera may be the best option. Additionally, light pollution filters are not as effective when shooting untracked, as long exposures are required. Instead, a tracker is recommended.
Traditional light pollution filters worked by filtering out the emissions lines of specific types of streetlights, such as sodium vapor lamps, which emit light at a wavelength of 589nm. However, with the switch to white LEDs in many cities, these filters are not as useful as they once were, as LEDs emit light in a much broader spectrum. Instead, dual-bandpass narrowband filters like the Optolong L-Enhance/L-Extreme are recommended for capturing emission nebulae.
Overall, light pollution filters can be a valuable tool for astrophotographers, helping to enhance the visibility of celestial objects and improve the clarity, colour, and contrast of images.
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Light pollution filters for telescopes
Light pollution filters are essential tools for astronomers and astrophotographers. They help mitigate the negative effects of artificial lighting that obscures the night sky. These filters enhance the visibility of celestial objects by selectively blocking certain wavelengths of light associated with urban light pollution while allowing important wavelengths, such as those emitted by stars, nebulae, and galaxies, to pass through. Various manufacturers, including Apertura, Askar, Celestron, DwarfLab, Optolong, and Vaonis, offer a range of light pollution filters to cater to both amateur and professional astronomers.
Light pollution filters come in different shapes, sizes, and bandpasses. When choosing a light pollution filter, it is important to consider the specific needs and setup of your telescope. For example, if you plan to use your telescope for astrophotography in an urban area, a light pollution filter that blocks common sources of light pollution, such as sodium vapour and mercury vapour streetlights, would be a good choice. On the other hand, if you live in an area with less light pollution, a general-purpose light pollution filter may be sufficient.
It is worth noting that light pollution filters are not always necessary for visual astronomy, especially when observing bright planets or deep-sky objects. In some cases, light pollution filters can even make it more difficult to see certain objects. However, in areas with heavy light pollution, a filter can make a significant difference in the visibility of celestial objects.
When choosing a light pollution filter, it is important to consider the type of camera or telescope you are using. For example, dual-band filters may not be effective if your camera is not astro-modified. Additionally, older light pollution filters may not work as well with newer LED lights, which emit light in a broader spectrum. Multi-narrowband filters can be a good option in these cases, as they isolate emission lines and block out everything else, effectively eliminating most obtrusive artificial light.
Overall, light pollution filters can be a valuable tool for astronomers and astrophotographers, helping to reduce the negative impact of light pollution and improve the visibility of celestial objects. By selecting the right filter for your specific needs and setup, you can enhance your stargazing and astrophotography experience.
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Light pollution filters for beginners
Light pollution emitted by houses, cars, street lamps, and more can ruin astro shoots, preventing you from being able to see or capture the stars and constellations above, no matter how clear the sky is. Light pollution filters can fix this by suppressing the emissions generated by artificial lighting.
There are two main types of light pollution filters: broadband light pollution filters and ultra-high-contrast or narrowband OIII filters. Broadband light pollution filters attenuate the wavelengths of light associated with older mercury vapour and low-pressure sodium lighting. They do an excellent job of improving contrast, although they all dim the overall view. Ultra-high-contrast or narrowband OIII filters are very effective on emission objects like nebulae.
When choosing a light pollution filter, it is important to consider your imaging location and the types of projects you like to shoot most. For example, if you live in an area with a lot of light pollution, a broadband light pollution filter may be a good choice. If you are interested in capturing images of nebulae, an ultra-high-contrast or narrowband OIII filter may be a better option.
It is also important to consider the size of the filter. Most astronomy filters are designed for telescope equipment, so if you are using a camera lens, you may need a clip-in sensor that clips inside your camera. Additionally, some filters have extra features such as anti-reflective coatings or water-repellent properties.
Finally, it is worth reviewing example images taken by others in similar conditions to get a sense of how a particular filter will perform. Higher-quality filters typically offer better optical elements with multicoating that will reduce any visible optical aberration and artifacts in the photo, such as flaring and/or ghosting.
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Light pollution filters for DSLRs
Light pollution is a serious issue for astrophotographers, as it washes out the sky, lowers contrast, and obscures the details of celestial objects. Light pollution filters can be a solution to this problem, blocking out the wavelengths of light emitted by sodium vapour lamps, the main cause of light pollution. However, not all light pollution is caused by sodium vapour lamps, and white light from LEDs is becoming more common. While these new LED lights may reduce the ugly yellow/orange glow from cities, they still produce light pollution.
When choosing a light pollution filter for your DSLR, it's important to consider the type of camera you have and the sources of light pollution in your area. Some filters are designed specifically for telescope equipment and may not be compatible with your DSLR. Additionally, the effectiveness of a light pollution filter will depend on the type of light pollution present. For example, if you live in an area where light pollution is mainly caused by orange sodium vapour street lights, a CLS filter may be a good option. On the other hand, if your area has transitioned to LED lighting, a narrowband filter might be more suitable.
There are several light pollution filters on the market that are worth considering for your DSLR. The Haida NanoPro MC Clear-Night light pollution filter is a premium option that effectively removes the yellowish glow often seen in nighttime cityscapes. It is available in a standard size for DSLR cameras and a smaller size for drones. Another option is the Urth Neutral Night Plus, which offers a balance between affordability and quality, and is produced by an environmentally-conscious brand. The K&F Concept Natural Light Pollution Filter is also reasonably priced and does a good job of blocking yellow and orange wavelengths.
If you're looking for a more affordable option, the Natural Night filter is a good choice for eliminating skyglow and colour casts without breaking the bank. The Irix Edge is another durable and affordable option that targets yellow light and comes with anti-reflective coatings. Hoya’s light pollution filter is also worth considering, as it cuts out yellow and green casts and has a low profile, making it suitable for wide-angle lenses. Astroklar light pollution filters offer a wide range of sizes, making it likely that you'll find one that fits your lens.
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Light pollution filters for cityscapes
Light pollution can ruin your night photos, removing all the detail from the sky and reducing the detail of the stars. Light pollution filters can fix this by suppressing the emissions generated by artificial lighting. They are specially engineered to cut down on particular wavelengths, blocking out specific colours. Most light pollution filters block out between 570nm-620nm, which covers the orange and red parts of the spectrum.
There are various light pollution filters available for nighttime cityscape shots. For example, the Kase Wolverine Neutral Night filter is a great choice for light pollution reduction. It reduces the orange glow from streetlights, allowing the natural reddish light from nebulas to shine through. It is made from Pro HD optical glass, is scratch-resistant, and can withstand accidental bumps. It comes in various formats, including screw-on filters, square plates, and clip-in filters for mirrorless cameras.
Another option is the NiSi Natural Night filter, which was one of the first filters to help reduce artificial light in photography. It is great for nighttime photos, reducing light pollution by blocking the yellowish tint from streetlights. It is available for the DJI Phantom 4 Pro and other advanced DJI Mavic Pro drones, making it ideal for capturing nighttime cityscapes from above. However, it is extremely thin and delicate, so it must be handled with care.
The K&F Concept Natural Light Pollution Filter is another reasonably priced option that blocks yellow and orange wavelengths. This broadband filter improves nightscapes by reducing light pollution from artificial sources and enhancing starlight. It is scratch-resistant and available in drone-sized sizes.
For those on a budget, the Natural Night filter is a good choice for eliminating skyglow and colour casts without breaking the bank. It is also environmentally conscious.
If you are looking for a filter that fits on the DJI Phantom 4 Pro and Mavic Pro, the Antlia Triband RGB Ultra II filter is a good option. It has a broader blue bandpass to help bring out true-to-life hues in areas with naturally faint blue tones. This feature prevents unwanted green influence from overtaking the blue tones, a common issue in light-polluted environments.
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Frequently asked questions
Some affordable light pollution filters include the Natural Night filter by NEEWER, the K&F Concept Natural Light Pollution Filter, and the Urth Neutral Night Plus.
The Optolong L-eXtreme is an ultra-narrowband light pollution filter that works well with DSLRs. Other options include the MSM Nomad and the L-Enhance.
The Orion UltraBlock Narrowband filter, the Baader light pollution filter, and the Lumicon UHC Filter are all good options for telescopes.
