There are objects that are so interesting that you should get round to observing them at least once. This includes the famous Horsehead nebula, which adorns so many wonderful astronomy images. But what would it be like to see it 'live' with your own eyes? With the Svbony H-beta filter and a telescope above 8"-10" in aperture, your wish can come true. The filter allows light to pass only in the hydrogen emission region at 486nm. With a bandpass of 25nm, it is particularly suitable for visual observing. The filter will do all of the following: improve contrast between the object and the night sky background provide a particularly good image under a dark sky be particularly useful for observing the Horsehead nebula, Cocoon nebula and California nebula The H-beta filter offers you something more than just the 'everyday sky'; it lets you explore the extraordinary! Through the use of filters, the Horsehead Nebula can be clearly seen. Filter with metal mount 2" filter threads; Threaded to fit 2" eyepieces and threaded diagonal barrels This premium Svbony Narrowband H-beta filter is designed for nebula observation allowing 25nm bandwidth of light centered on a wavelength of appr 490nm throughout, about halfway between the H-beta emission line and OIII. It also reduces the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). H-beta emits 486.1nm and it is a blue colored filter. Some images of planetary nebulae and supernova remnants are taken with H-alpha, H-beta and OIII filters. They show great structural details, but have natural colors, looking like an RGB image. ★Main Use and Performance Suitable for visual observation on most emission nebulae, planetary nebulae and supernova remnants. Suitable for viewing on bright nebulae like M42 Orion Nebula in heavy light pollution. Use with a large aperture telescope under clear and dark viewing conditions with good seeing. Due to the fact that this filter will let through a larger amount of light around the OIII emission line, its main purpose is visual observations, however it can also be used with a small telescope for imaging deep sky objects. Light pollution filters do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula. ■WARNING: Svbony filters are not designed for solar observation. DO NOT LOOK AT THE SUN WITH ANY Svbony FILTER as permanent eye damage will be the result. ★Technical Data ▶Schott substrate material ▶Surface Quality: 60/40 ▶Fine-optically polished to ensure accurate 1/4 wavefront and < 30 seconds parallelism over both surfaces ▶90% transmission at major H-beta line 486.1nm, Partial transmission (appr 65-70%) of OIII line at 495.9nm. ▶Precision off-band blocking, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm). ▶Filter Cell Ultra-thin filter cell minimise vignetting by maximising possible clear aperture . Aerometal Material ▶Precise CNC Machining ▶Sand Blasting Process ▶Black Anodized Finish ▶Extinction Treatment to Prevent Reflection ▶Laser Engraving No Fading Ps: The Major Emission Lines of Nebulae: H-α 656.3nm, H-β486.1nm, OIII 495.9nm, OIII 500.7nm The Major Emission Lines of Artificial Light Pollution: Hg 435.8nm, 546.1nm, 577nm, 578.1nm, Na 598nm, 589.6nm, 615.4nm, 616.1nm SVBONY 2" H-Beta 25nm Visual Nebulosity Eyepiece Filter The beta line of hydrogen with a central wavelength of 486nm in H-Beta is suitable for observing the difficult-to-capture Horsehead Nebula in Orion and the California Nebula. For Visual Observation Multi-coated Glass The H-Beta filter is made with Germany high-quality Schott glass that has been multi-coated with an ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength, or CWL；Glare and ghosting are prevented by reflection coat.. Hard Anodize Finished Aluminum Frame Hard anodize finished aluminum frame with CNC metal made technology to stand the wear and tear. Filter with metal mount 2" filter threads to fit 2" eyepieces and threaded diagonal barrels. 90% transmission at 44mm Clear Aperture Package Includes 1XSVBONY 2" H-Beta 25nm Filter 1XSturdy Plastic Cases

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