Meghan Hodges
Light pollution is a common challenge for night photographers, caused by excessive or misdirected artificial light that brightens the night sky and reduces the visibility of stars, planets, and other celestial objects. However, with the right techniques and tools, it is possible to capture stunning night sky photos even in light-polluted areas. This involves choosing the right gear, adjusting camera settings, using light pollution filters, and adopting creative approaches to incorporate light pollution into your compositions. By embracing the challenges posed by light pollution, photographers can create unique and captivating images that showcase the beauty of the night sky in a new light.
| Characteristics | Values |
|---|---|
| Camera settings | Adjust camera settings, including exposure, autofocus mode, and ISO settings |
| Location | Find a dark, remote location, away from cities and artificial light sources |
| Tools | Use smart tools and filters to reduce light pollution |
| Planning | Plan the timing and location to get a clear view of the night sky |
| Post-processing | Use post-processing techniques to enhance the image and reduce light pollution |
| Composition | Incorporate light pollution into the composition to create interesting effects and silhouettes |
| Camera features | Use cameras with features like Live Composite to improve night photography |
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What You'll Learn
Use the Bortle Scale to find a dark location
The Bortle Scale is an invaluable tool for night photography. It was developed by amateur astronomer John E. Bortle in 2001 and published in Sky & Telescope magazine. The scale measures the darkness of the night sky, ranging from Class 1 (pristine, dark skies) to Class 9 (inner-city skies with significant light pollution).
By understanding each class of the Bortle Scale, photographers can make informed decisions about their shooting locations and techniques. For example, a Class 2 location, such as the Utah Badlands, offers pristine dark sky conditions with some light pollution visible at the horizon. This knowledge can help photographers plan their shoots and choose the right equipment.
There are several tools available to help determine the Bortle rating of a location. One option is to use a light pollution map tool, which allows users to plot a specific point on the map and get a Zenith sky brightness reading. Another option is to use a smartphone app called Clear Outside by FLO, which uses GPS to provide an accurate reading of the night sky's Bortle scale class and an estimated sky quality magnitude.
Additionally, photographers can use the Stellarium planetarium software to adjust the amount of light pollution and match the view in the software with the brightness of the night sky from their coordinates. The faint stars will begin to disappear as you increase the light pollution number, helping you visualize the impact of light pollution on your photography.
By using the Bortle Scale and these associated tools, photographers can find dark locations for night photography and improve their astrophotography skills.
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Adjust your camera settings
Adjusting your camera settings is crucial to capturing stunning night sky photos, even in light-polluted environments. Here are some detailed instructions to help you get started:
Firstly, consider using a lens with a wide aperture setting. Starting with a lens wide open, or stopped down by only one stop, will allow more light to enter the camera, which is beneficial when photographing in low-light conditions. It is recommended not to stop down past f/4 to avoid reducing the amount of light entering the camera.
The ISO setting can be adjusted according to your preferences and lighting conditions. A higher ISO setting, such as ISO 6400, can be used to increase light sensitivity, but it may introduce more noise or grain into the image. For a sharper image with less noise, it is recommended to use a lower ISO setting, such as ISO 400 or ISO 200, which also allows for longer exposures.
The autofocus mode plays a crucial role in ensuring that the stars and sky are in focus. Set your camera to autofocus mode and select the 'Starry Sky AF' option if available. This mode is specifically designed for photographing the night sky and will ensure that the stars remain sharp. If your camera does not have this mode, manual focus lenses can be used, but it is essential to ensure that the focusing ring is correctly positioned for accurate focusing.
Utilising the Live Composite feature, available in certain camera systems, can greatly enhance your night sky photography. This feature allows you to capture multiple moments from the scene and then seamlessly stitch them together, creating unique textures in your images without the need for time-consuming post-processing in Photoshop.
Additionally, consider using a star tracker if you want to capture deep-sky objects. Star trackers compensate for the Earth's rotation, enabling longer exposures without star trails, thus improving image quality and reducing light pollution's impact by increasing the signal-to-noise ratio.
Lastly, experiment with different exposure times to find the optimal setting for your specific lighting conditions. In light-polluted areas, you may need to use shorter exposure times to avoid overexposing the image. However, if you are in a darker location, you can take advantage of longer exposure times to capture more light and detail in your night sky photographs.
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Use a star tracker to compensate for Earth's rotation
Light pollution is a significant challenge for night photographers and astrophotographers, as it reduces the visibility of stars, planets, and other celestial objects. It originates from sources such as streetlights, billboards, commercial buildings, and residential areas. When photographing the night sky in light-polluted areas, you may encounter issues such as washed-out skies, reduced contrast, unwanted colour casts, and limited exposure times.
To compensate for light pollution and capture clear images of the night sky, photographers can use a star tracker. A star tracker is a device with a small motor that compensates for the Earth's rotation by revolving in the opposite direction. This allows the device to follow the stars' movement in the night sky, enabling photographers to capture sharp images of the stars with extended shutter speeds.
By using a star tracker, photographers can overcome the issue of star trailing, which occurs due to the Earth's rotation. Star trailing results in blurry images as the stars appear to move in the sky during the exposure. With a star tracker, photographers can take longer exposures without star trailing, improving image quality and reducing light pollution's impact.
There are various star tracker models available, such as the MSM Rotator, Star Adventurer Mini, iOptron Skytracker Pro, and Sky-Watcher Star Adventurer. These devices are designed to be lightweight, portable, and easy to set up. They can be polar-aligned to capture pinpoint stars and track the movement of celestial objects accurately.
In addition to using a star tracker, photographers can employ other techniques to mitigate light pollution. This includes choosing dark locations, using light pollution filters, adjusting camera settings, and post-processing images to enhance details and reduce unwanted light artefacts. With careful planning and the right equipment, photographers can capture breathtaking images of the night sky, even in light-polluted environments.
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Use light pollution to your advantage
While light pollution can be a nuisance for night photographers, it can also be used to your advantage to create unique and artistic images. Here are some tips on how to use light pollution to enhance your night photography:
Embrace the Horizon: Light pollution from distant cities or towns can help define the horizon in your photos, especially when shooting in dark locations. It can silhouette the horizon, backlighting the transition from earth to sky and adding interest to your compositions.
Incorporate Light Pollution into Compositions: Instead of avoiding light pollution, try incorporating it into your shots. Distant city lights, bright streetlights, power plants, or even passing car headlights can add a unique element to your night photography. These light sources can help separate your subject from the background, artistically define shapes, and create a sense of depth in your images.
Utilize Long Exposures: Light pollution can be used creatively with long exposures. Clouds, for example, take on a unique texture when photographed with long exposures, creating dramatic and jaw-dropping scenes that would otherwise require extensive editing in Photoshop.
Play with Colours: Light pollution can introduce unwanted colour casts, such as an orange or yellow glow, in long-exposure images. However, you can tweak these colours during post-processing to correct or enhance them, creating artistic effects that wouldn't be possible without light pollution.
Enhance Contrast: Light pollution can reduce the contrast between stars and the dark background. To counter this, selectively increase the contrast during post-processing to make the stars stand out. This will help compensate for the impact of light pollution while adding depth to your night sky images.
By embracing light pollution and using it creatively, you can push the boundaries of your photography, triggering ingenuity and resulting in images that pleasantly surprise you and your audience.
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Use the ETTR technique and adjust in post-production
When photographing the night sky with light pollution, you can use the ETTR (Expose to the Right) technique and adjust in post-production to capture a lot more stars. This technique involves overexposing the image so that the majority of the data is on the right side of the histogram. By doing this, you are able to capture the maximum data quality for your image, which can then be adjusted in post-production to bring it back to a normal exposure.
To use the ETTR technique, first set your ISO to 100 or your camera's base ISO. If your camera has Live View, turn that on, as well as the Live View histogram if it has one. With your ISO at base, set your aperture according to the depth of field you want. Next, adjust your shutter speed. Play around with different shutter speeds until you can get the data as far to the right on the histogram as possible without touching the edge.
Once you have taken the photo, you can then adjust it in post-production to darken the image and bring it back to a normal exposure. This can be done using software such as Lightroom or Capture One, which have features like AI Noise Reduction that can help improve your images.
The ETTR technique is especially useful when photographing the night sky in light-polluted areas, as it can help to capture more stars and improve the overall quality of the image. However, it is important to note that it may not work in all situations and may require some experimentation to get the desired results.
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Frequently asked questions
Light pollution is the excessive or misdirected artificial light in the night environment, which disrupts the natural darkness of the sky. It can make it harder to capture faint celestial objects and reduce the contrast between the stars and the dark background. Light pollution can also limit exposure times and cause unwanted colour casts in long-exposure images.
A star tracker can compensate for the Earth's rotation, allowing longer exposures without star trails. You can also use filters that cut down on light pollution. OM SYSTEM cameras have a Live Composite mode, which makes it easier to capture the night sky in light-polluted areas.
Use a lens wide open or stopped down by only a stop, and an ISO setting of 400 or 200 for the least grain and longer exposures. Set the autofocus mode to Starry Sky AF to ensure the sky and stars are in focus. If you're shooting the Milky Way, switch to Bulb mode on your DSLR camera and set the aperture to 2.8, ISO to 6400, and focal length to 16mm.
