sur June 26, 2024

The StarScape filter selectively absorbs specific wavelengths of strong light emitted by artificial urban light sources, which are the main cause of light pollution, while allowing the wavelengths from celestial bodies to pass through. This effectively cuts light pollution without compromising the colors of celestial objects.Marumi StarScape Kit

Sources of Light Pollution

Light pollution refers to artificial light sources such as:

  • Mercury lamps (435.8, 546.1, 577.0, and 579.1 nm)
  • Sodium lamps (589 nm)
  • LEDs (approx. 470 nm)
  • Fluorescent lamps
  • Automobile headlights that brighten the night sky and make it difficult to see stars

The transmission curve above shows a decrease in transmittance for specific visible light wavelengths (400-700nm), such as mercury lamps (435.8, 546.1, 577.0, and 579.1 nm), sodium lamps (589 nm), and LEDs (approx. 470 nm). This indicates that these artificial light sources emit harmful orange and yellow light, which can interfere with astronomical observations and contribute to light pollution, making it difficult to see cold color stars in the night sky.


Light Pollution in the image

The cityscape image on the left without StarScape filter and on the right with StarScape clearly illustrates the presence of yellowish/orange light pollution at night. The StarScape filter plays a crucial role in transforming the impression by creating a more authentic bluish night scene.


Marumi offers three different filter construction for StarScape.
- StarScape for Screw-in filter
- StarScape for M100, Square fiter
- StarScape for Magnetic Slim

Thank you for your attention! 

Marumi Team