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  • SV132 H-Beta eyepiece filter makes it possible to view the elusive Horsehead, California, and Cocoon Nebulas in dark skies;Great used with a moderate to large aperture telescope and clear dark skies
  • Optical high precision double side polishing; Filter substrate is fine-optically polished to 1/4 wave and <30 parallelism over both surfaces; Avoid halos
  • Precision double-sided optical coatings improve transmission and cut-off depth; Executes with a transmission of over 90% and completely rejects light pollution
  • High value transmission of pass-band and optical density of off-band is assured through planetary rotation system, a homogenous and precise coating procedure; The high optical quality of SV132 filters guarantees no loss in sharpness or contrast
  • Filter with metal mount 1.25" filter threads; Threaded to fit 1.25" eyepieces and threaded diagonal barrels
US$ 49.49 US$ 54.99 -10%
  • 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
US$ 53.99 US$ 59.99 -10%