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

    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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