Light pollution - how to still get beautiful night shots and clear starry skies
The Neutral Night Filter by Kase is an astro-clear filter and is also known as light pollution filter or night light filter. The aim of using a light pollution filter is to give the night sky its cool darkness and to remove the typical yellow tinge from the night shots. In rural areas, the Astroklar Filter can also improve the photography of the starry sky by increasing the contrast between the night sky and the stars, which is reduced by light pollution. This allows you to create clear images of the starry sky and natural city and landscape shots with nightly "cold" without a yellow tinge.
The high-quality images also make post-processing easier because you can achieve better contrasts and expose longer where you had to stop down without a filter because of the light pollution caused by the disturbing light.
What can the neutral night filters be used for?
Clearly primarily for use in nighttime landscape photography and astrophotography. By using our neutral night filters, your images achieve more details and a much clearer and higher-contrast image of the stars and astronomical deep sky objects. Our Astro Filter reduce the incidence of light by about a 2/3 aperture.
Did you know that a city with 25,000 inhabitants is already sufficient to artificially brighten the surroundings within a radius of 20 kilometers and thus make the night sky appear cloudy and poor in contrast, or to give night shots a yellow cast. The artificial light sources that cause the greatest light pollution are sodium vapor lamps (light wavelength approx. 590 nm) and mercury vapor lamps (light wavelength 545 nm and 580 nm). Among other things, these wavelengths block our night light filters and thus enable pictures of a starry sky and night pictures without a yellow tinge. But how exactly do the filters work against light pollution?
How do Kase Filter Astro Filters work?
To understand exactly how the Astroklar series night light filters work and how they make astrophotography and night photography easier, you have to understand exactly how the so-called light bells are created. The part of the artificial light emitted upwards into the atmosphere reflects again on the atmospheric layers, such as on atmospheric dust and water, and is thus widely dispersed. This creates the so-called light bell, because the air is brightened, it is penetrated by light. A city with around 25,000 inhabitants is enough to brighten up the sky within a radius of about 20 kilometers and thus disrupt astrophotography and city as well as landscape photography at night due to light pollution. So it is a side effect of industrialization.
The largest producers of light pollution are industrial plants, large cities and highly directional spotlights from airports or high beams from cars and light art such as sky beamers and laser shows. This light smog then envelops nocturnal motifs like a kind of veil, so that the natural nocturnal light has a yellowish tinge and thereby reduces the visibility of stars.
Our Astroklar filters are specially coated so that as far as possible all light waves of the entire color spectrum can pass and mainly the yellow and orange light wavelengths are blocked. In this way, the unwanted wavelengths do not reach the sensor of the camera. The resulting cleaning of the light waves ensures more detailed shots with significantly more brilliance and structure, especially in nighttime city and landscape photography or astrophotography.
Due to the night light filter, the recordings initially appear much cooler. Because the filtering and the associated reduction in the yellow and orange light waves make the cooler colors all the clearer. Here we recommend setting the manual white balance to 3600K in the dark, for example, and correcting the color temperature for the exposure between +700 K and +1500 K from the selected white balance without a filter to ensure nighttime color fidelity and the expected "coolness." “To counteract.
Instructions - how do I use Astroklar filters?
- Set up the tripod, attach the camera and install the remote release
- Select the desired motif & adjust the image section
- Set manual white balance (e.g to 3600K)
- Counteract the cooler color temperature if necessary by increasing the white balance by + 700K to + 1500K
- Screw filter: Screw in the neutral night filter.
- Insert filter: The holder for the 100mm and 150mm plug-in filter system can also be attached very easily. Then you can simply slide the neutral night rectangular filter into the guide rail. Then turn the filter holder so that you optimally catch the photo motif.
- Set the exposure time and take a picture with the remote control
This is what distinguishes the Astroklar filters from Kase
The multiple coating
Both the screw-on filter and the rectangular filter for the filter holder have the same coating. Another great advantage for astrophotography is that our Kase night light filters are neutral, especially in the IR light range.
The double-sided nano coating
Both filter types also have a special nano coating that not only prevents reflections, but is also water, oil and dirt repellent. This ensures that the filter glass can be cleaned very easily.
Astro filter as a round filter or as a rectangular filter?
This depends primarily on personal preferences. The main differences are in the possibility of combining different filters. For example, you can already integrate a CPL filter in the 100mm filter holder for our plug-in systems and combine it with your plug-in filters. All ’our Astroklar Light Pollution Filters ensure clear and starry night skies, such as night photography with more details and structure without yellow-orange light pollution - regardless of whether they are round or rectangular filters.
Advantages of Kase Astro rectangular filters:
Different filters are easier to combine
Magnetic CPL polarizing filter can be integrated into the 100mm filter holder
Foam cover protects against additional light when the ND filter is used between the holder and the filter
Seal light-tight between lens and filter
Advantages of the Kase Astro round filter:
- Can be screwed directly onto the optics
- Much lighter in weight
- Seal light-tight between lens and filter
Most of the time, the choice is based on your general preference for how you work with filters.
Only with an Astro round filter, or combined as a neutral night rectangular filter with a polarizing filter. In general: Especially when it comes to combining filters, this is usually easier to implement with a plug-in filter system than with round filters. Filters can then be inserted into the filter inserts of the rectangular filter holder. This is particularly helpful when using gradient filters, since you can adjust the filter gradient according to the image composition.
Circular filters are mostly used when you only want to use a certain type of filter. So if you only need a Kase Filter Neutral Night Filter and have a lens with a screw thread, you can simply unscrew the filter and take pictures. No additional filter holder is required.