Explore Scientific Filters 2" H-Beta filter (54894)

One of the major challenges in exploring the night sky is the brightening caused by artificial lights, such as streetlights. In areas near towns or cities, the night sky is not truly dark, which significantly reduces the visibility of objects beyond the Solar System.

For certain types of celestial objects, contrast can be dramatically improved by blocking unwanted artificial light. The H-Beta filter utilizes a unique property of emission nebulae. These objects emit light in specific colors known as emission lines, which are associated with chemical elements—in this case, hydrogen. The H-Beta nebula filter blocks all other colors (including nearly all artificial light) and allows only the hydrogen emission line to pass through. The result is remarkable: nebulae that were previously invisible become visible. For example, in suburban skies, the Horsehead Nebula is almost impossible to see with a 300mm telescope. However, with this filter, the nebula and its structures can be observed clearly and effortlessly. This filter is an essential tool for every visual observer!

Specifications

Capacity

• Connection (to the telescope): 2"

• Frame: 2"

Equipment

• Other contents: Protocol

General

• Type: Filters

• Type of build: Line filter

Area of Application

• Anti light-pollution: Yes

• Visually useful: Yes

• Hydrogen nebulae: Yes