- 2" Eyepiece Filter; with metal mount 2" filter threads
- For Horsehead Nebula California; and Cocoon Nebulae in Dark Skies
- Mainly aimed at the 486nm (blue) line spectrum nebula; filters out the interference of other light; can improve the contrast of the nebula
- 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
- To see a sufficiently dark nebula; ensure a large enough luminous flux; needs to be observed with a large-aperture telescope
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