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

    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