Celestron Nebula Schott B270 Glass Filter for Celestron Origin Intelligent Home Observatory

Immerse yourself in the beauty of celestial objects at night with this Celestron H-alpha H-beta OIII (Hα-Hβ-OIII) Imaging Filter. This filter is specially designed to allow smooth throughput of light wavelengths while simultaneously blocking other wavelengths that could degrade the quality of the image and hamper its intricate details. This allows the filter to give you detailed images rich in color against a black sky background, creating a beautifully contrasting effect. This filter’s surface is 100 percent optically flat and defect-free.

Emission nebulae emit Hα at 656nm, Hβ at 486nm, and OIII at 496 by 501nm light wavelengths. By transmitting only these wavelengths while blocking the other wavelengths in this spectrum, this Origin filter eliminates light pollution to a great extent. In simple terms, it blocks the ‘bad’ light while letting the ‘good’ light associated with emission nebulae pass through its sensor. Apart from less pollution, you will notice a better contrast and overall rich image quality. Owing to high transmission at the critical wavelengths, the nebula remains unaffected and only the background appears darker. This filter even blocks the natural skyglow for enhanced imagery.

Ideal for imaging emission nebulae like the North America Nebula (NGC 7000), Lagoon Nebula (M8), Orion Nebula (M42), the Carina Nebula (NGC 3372), and others, the Celestron Nebula Filter offers maximum light transmission in the key Hα-Hβ-OIII wavelengths. The transmission spectrum is 85 percent for Nebula filter. It may even be greater at key wavelengths like 486nm, 496nm or 501nm, 656nm and lesser than 0.5 percent in others. It is advisable to keep away from this filter when observing broadband emission objects like galaxies and star clusters. It is recommended to remove this filter and reinstall the clear optical window for Origin when viewing broadband emission objects. Similar narrowband filters in the market have an even narrower bandpass at critical Hα-Hβ-OIII wavelengths. However, these block a lot of incoming Hα-Hβ-OIII light for an f/2.2 optical system like the 6-inch RASA Origin since RASA allows light into a steeper angled filter causing a spectral shift. To avoid blocking the light from the nebula, it is advisable to use filters that are designed for use at f/2.2 only.

The Celestron Nebula filter has a machined aluminum black anodized cell with a knurled rim allowing a comfortable and easy grip during the installation process. The anti-reflection coatings on the filter help to suppress reflections on the glass. Easy to install, the filter sits directly on the filter drawer on the front lens cell, just where the optical window is installed. Remove the optical window and place the filter; it is that easy. To keep the filter safe and protected when not in use, it comes with a foam-lined plastic storage case. There is no need for an adapter. Since Origin individually tests every filter, the filter also includes a spectral transmission graph that portrays the results of your filter’s test.