One of the most important obstacles for the exploration of the night sky is the brightening of the night sky by artificial lights, such as streetlights. The night sky is not really dark in the vicinity of towns or cities, which reduces the visibility of objects beyond the solar systems enourmously. Depending on the type of the celestial object it is possible to increase the contrast dramatically by blocking the annoying artifical light.

The Explore Scientific CLS filter uses a characteristic property of the artificial illumination. Streetlights and lamps shine in special colors – the typical colors of high-pressure or mercury lamps. The Explore Scientific CLS nebula filter blocks those colors and thereby increases contrast – the light ot the celestial objects can pass the filter. The result is astonishing: suddenly objects are visible at locations that were completely empty without filters. In suburbian skies for example the large galaxy M101. By using this filter you can see the nebulae and their structures. A must for every visual observer. The Explore Scientific CLS nebula filter come with a individual test certificate – your guarantee to receive a premium filter.


  • Blocks annoying artificial light – e.g. of streetlights
  • Enables observation of low light Deep Sky objects
Brand Explore Scientific
Warranty, years 2
EAN 4007922000091
Package size (LxWxH), cm 16.3x13x4.5
Shipping Weight, kg 0.26

Returns Policy

We have a 14-day return policy. If you are not satisfied with your purchase, please return it in its original packaging and be sure to put the original product packaging inside the shipping box to avoid any damage..

All items must be in their original condition and unused. The value of your purchase will be refunded. .

Shipping charges will not be refunded.

If the return is due to a defective product, you may be compensated for the return shipping.

Please contact us for more details if you need to make a return..


- From 0 to 2 kg - shipping cost: 12,50 euros.

- From 2.001 kg to 30 kg - shipping cost: 17,00 euros.

- From 30,001 kg - shipping cost: 30,00 euros.

In case of collection at our warehouse or resale points - the shipping is free.

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