Bresser EXPLORE SCIENTIFIC 2 UHC Nebula Filterare

Obstacles in Night Sky Exploration

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 system enormously.

Enhancing Contrast

Depending on the type of celestial object, it is possible to dramatically increase the contrast by blocking annoying artificial light. The EXPLORE SCIENTIFIC UHC filter zeros in on the wavelengths of so-called emission nebulae. Those objects glow in special colours - their emission lines. These emission lines are linked to chemical elements - in this case, hydrogen at 486nm and 656nm, plus oxygen at 496nm and 501nm.

Functionality of the UHC Nebula Filter

The EXPLORE SCIENTIFIC UHC nebula filter blocks all other colour wavelengths (and thereby nearly all of artificial light) and only the emission lines of hydrogen and oxygen can pass through the filter. The result is astonishing; suddenly, nebulae are visible at locations that were completely invisible without filters.

Visibility of Nebulae

In suburban skies, for example, the following nebulae are not clearly visible:

• Owl Nebula M97
• Veil Nebula NGC 6992
• Bright Dumbbell Nebula M27

Using this filter allows you to see nebulae and their structures in much finer detail. It is a must for every visual observer.

Quality Assurance

The Explore Scientific nebula filters come with an individual test certificate - your guarantee to receive a premium filter.