Brian Barton
Light pollution filters are used in astrophotography to reduce the negative effects of artificial lighting, such as streetlights, that can obscure celestial objects and wash out the night sky. They work by blocking specific wavelengths of light associated with light pollution while allowing important wavelengths, such as those emitted by stars, nebulae, and galaxies, to pass through. There are several types of light pollution filters available, including broadband (LPR), narrowband (UHC), and line filters, as well as dual-narrowband and multi-bandpass filters. The best filter for a specific use case will depend on factors such as the imaging location and the types of projects being shot.
| Characteristics | Values |
|---|---|
| Purpose | To block out specific light pollution wavelengths, while preserving light emitted by celestial objects |
| Functionality | Suppresses the wavelengths of light emitted by manmade sources to allow light from astronomical objects through |
| Effectiveness | Does not reduce all forms of light pollution, particularly ineffective against sources emitting across the full visible spectrum, such as car headlights and building illumination |
| Use Cases | Beneficial for observing bright nebulae under light-polluted skies, improving aesthetics by darkening the background |
| Types | Broadband, dual-narrowband, multi-bandpass, ultra high contrast, narrowband OIII, LPR, UHC, L-Pro, H-Alpha, dual bandpass narrowband, L-Enhance, L-Extreme, MSM Nomad, CLS, Astroklar |
| Installation | Can be screwed to the lens, slid into a filter holder, clipped inside the camera, or installed on a telescope |
| Features | May include anti-reflective coatings, water-repellent, oil-repellent, scratch-resistant, or built for durability |
| Compatibility | Available in various sizes to fit different lenses, but some filters are designed specifically for telescopes |
| Performance | May enhance contrast, improve clarity, and produce more natural colors in astrophotography |
| Affordability | A range of options exist, from affordable to expensive models |
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What You'll Learn
Multi-broadband filters
One example of a multi-broadband filter is the SVBONY SV260, which has a 300-1000nm wavelength working range and is designed for starfield shooting and deep-sky photography. It enhances stars and celestial bodies, making deep-sky observations clearer. It has over 90% peak transmittance and reduces light loss, with an SII-OIII-SII band average transmittance of over 85%. It also enhances the contrast between the target object and the background.
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Multi-narrowband filters
The Optolong L-eXtreme dual narrowband filter is a popular choice, with bandpasses including Oxygen-III, Sulfur-II, and H-alpha. The SVBONY SV240 filter is another interesting design, with a wider bandgap that can capture broadband and narrowband images while filtering out most light pollution.
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Dual-bandpass narrowband filters
The most common wavelengths isolated in a dual-bandpass narrowband filter are h-alpha (656 nm) and OIII (500 nm). These filters are designed to be used with colour astronomy cameras or 'one-shot-colour' (OSC) cameras. When placed in front of an OSC camera, only selective wavelengths of light will pass through to the sensor, resulting in images with enhanced contrast and visibility of deep-sky objects.
The STC Astro Duo-Narrowband (Duo-NB) Filter is a popular choice, as it is the first filter to offer a dual-narrowband pass in a single filter. This filter is specifically engineered to capture a 7-12 nm bandpass for H-Alpha and Oxygen III nebula emission lines, resulting in ultra-high contrast images.
Another well-regarded option is the Optolong L-eXtreme filter, which is known for its balance between function and affordability. This filter is particularly useful for city astrophotography as it effectively blocks out unwanted light pollution.
It is important to note that dual-bandpass narrowband filters are most effective for emission nebulae, and the camera lens should be perpendicular to the filter to ensure optimal results.
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DSLR camera filters
Light pollution filters are designed to suppress the emissions generated by artificial lighting, such as light pollution from houses, cars, and street lamps. They can be useful for astrophotography, even in light-polluted areas, as they can block out specific light pollution wavelengths while preserving light from nebulae and galaxies.
When choosing a light pollution filter for your DSLR, it is important to consider the type of camera and the sources of light pollution in your area. For example, if you have old-school, yellow sodium vapour lamps in your area, a light pollution filter blocking this yellow glow would be ideal. In this case, a clip-in Astronomik CLS filter could be a good choice. On the other hand, if your area has already transitioned to LED lighting, a narrowband filter may be more suitable, although these can cause colour balance issues.
Some recommended light pollution filters for DSLRs include the Optolong L-eXtreme Filter, a dual-band filter that isolates important wavelengths from deep-sky objects, and the Astronomik UHC filter, which provides more contrast in nebulae. The Optolong L-Pro Clip-In Filter is another option, but it is essential to ensure you get the correct size for your camera body.
It is worth noting that light pollution filters may not always be necessary, especially for galaxies, as light pollution removal can often be done effectively in post-processing. Additionally, some broadband filters can block the light you are trying to capture, so it is important to consider your specific needs and camera setup when deciding whether to use a light pollution filter.
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Telescope filters
There are two main types of light pollution filters commonly used in telescopes: broadband light pollution filters and ultra-high contrast or narrowband OIII filters. Broadband light pollution filters are designed to attenuate or block the wavelengths of light associated with older forms of artificial lighting, such as mercury vapour and low-pressure sodium lights. They improve the contrast between celestial objects and the background sky, making it easier to observe deep-sky objects like nebulae and galaxies.
On the other hand, ultra-high contrast or narrowband OIII filters are particularly effective for observing emission objects like nebulae. These filters significantly reduce the background glow of light pollution, allowing the details of emission nebulae to stand out. They are also useful for observing under bright city lights.
In addition to these main types, there are other specialised filters available. For example, the Neodymium "Sky and Moonglow" filter is designed to reduce general skyglow, while the UHC (Ultra-High Contrast) filter blocks a large amount of light in the green, yellow, and orange wavelengths, which are common in light pollution. The L-Pro filter is another option that provides precise light pollution removal.
When choosing a light pollution filter, it's important to consider the type of telescope, the specific light pollution you are dealing with, and your personal preferences for the appearance of the stars and sky. Some filters may introduce a slight tint to the image, such as a blue-green or red tint, while others may dim the overall view. Testing and reviews can help determine the best filter for your specific needs.
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Frequently asked questions
Light pollution filters are accessories designed to block different levels of light pollution while allowing light from deep-sky targets to shine through. They are especially useful for those taking photographs in light-polluted areas.
Light pollution filters block out specific light pollution wavelengths while allowing light emitted by celestial objects to pass through. This helps to reduce the negative effects of artificial lighting that obscure the night sky.
There are two main types of light pollution filters: multi-broadband and multi-narrowband. Multi-broadband filters are suitable for photographing galaxies, reflection nebulae, dark nebulae, and star clusters. Multi-narrowband filters are ideal for celestial objects that emit light in specific parts of the spectrum, such as emission nebulae, planetary nebulae, and supernova remnants.
Some recommended light pollution filters include the Optolong L-Pro, Optolong L-Enhance, Optolong L-Extreme, and the UHC filter. The Celestron 2" Ultra High Contrast Light Pollution Reduction Filter is also a good option, reducing light pollution by over 97% throughout the bandpass.
When choosing a light pollution filter, consider your imaging location and the types of projects you typically shoot. Additionally, ensure that the filter is compatible with your camera or telescope setup. It is also important to note that light pollution filters may not be as effective with newer LED lights, which emit light in a very broad spectrum.
