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1.25'' Telescope Filter H-Beta 25nm fit Horsehead Nebula in Dark Sky observation
1.25'' Telescope Filter H-Beta 25nm fit Horsehead Nebula in Dark Sky observation
1.25'' Telescope Filter H-Beta 25nm fit Horsehead Nebula in Dark Sky observation
1.25'' Telescope Filter H-Beta 25nm fit Horsehead Nebula in Dark Sky observation
1.25'' Telescope Filter H-Beta 25nm fit Horsehead Nebula in Dark Sky observation
1.25'' Telescope Filter H-Beta 25nm fit Horsehead Nebula in Dark Sky observation
1.25'' Telescope Filter H-Beta 25nm fit Horsehead Nebula in Dark Sky observation
1.25'' Telescope Filter H-Beta 25nm fit Horsehead Nebula in Dark Sky observation
1.25'' Telescope Filter H-Beta 25nm fit Horsehead Nebula in Dark Sky observation
1.25'' Telescope Filter H-Beta 25nm fit Horsehead Nebula in Dark Sky observation
1.25'' Telescope Filter H-Beta 25nm fit Horsehead Nebula in Dark Sky observation

1.25'' Telescope Filter H-Beta 25nm fit Horsehead Nebula in Dark Sky observation

$ 21.11

Availability: 100 in stock
  • Thickness: 1.85mm
  • Item must be returned within: 30 Days
  • Features: 0.1% transmission Na at 589nm
  • Transmittance: 80% at 486nm
  • Surface quality: 60/40 (Refer to MIL-O-13830)
  • Model: SV132
  • Compatible Brand: Universal
  • Country/Region of Manufacture: China
  • To Fit: Catadioptric Reflector Refractor
  • Size: 1.25 in
  • Return shipping will be paid by: Buyer
  • FWHM: 25±3nm
  • Refund will be given as: Money back or replacement (buyer's choice)
  • Features:: 0.1% transmission Hg at 435nm and 578nm
  • Thread Size: M28.5*0.6
  • Blocking area: 400-700nm
  • Compatible Series: Universal
  • Type: filter
  • Compatible Model: Universal
  • Weight: 5.4g /0.19oz
  • Condition: New
  • Filter Type: Thin metal cells have a clear aperture of 26mm for
  • Restocking Fee: No
  • Brand: SVBONY
  • MPN: Does Not Apply
  • All returns accepted: Returns Accepted

    Description

    H-Beta 25nm Filter allows you to visually observe the ever-popular yet elusive Horsehead Nebula with large aperture telescopes under dark skies, and can also be used to image the Horsehead as well as others that emit light at 486nm, such as the California and Cocoon nebulae.
    Features:
    CNC machined and black anodized aero-metal filter cell that is ultra-thin to provide largest clear aperture
    Laser-engraved to prevent fading
    Multiple layers of anti-reflection non-cementing coatings applied via electron-beam gun evaporation with Ion-assisted deposition
    Filter substrate is fine-optically polished to 1/4 wave and <30 parallelism over both surfaces
    High value transmission of pass-band and optical density of off-band is assured through Optolong's planetary rotation system, a homogenous and precise coating procedure
    Each filter comes with a plastic case with high pressure EVA case lining
    Best used with a moderate to large aperture telescope and clear, dark skies
    WARNING: The filters are not designed for sun observation. DO NOT LOOK AT THE SUN WITH this FILTER. You would be BLIND if you fail to observe the warning.
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