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