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3pcs OPTOLONG 2" 25nm O-III Telescope Filter for Telescope 2'' Eyepiece Hot!!!

Product Description

Items Description

    • This
      Optolong OIII filter has a FWHM of 25nm, making it suitable for visual
      observations of most emission nebulae, planetary nebulae, and supernova
      remnants with a telescope of at least 6-8". The OIII broadband filter
      increases the contrast between the background sky and these objects, so
      it will also help with observations of bright nebulae, such as the Great
      Orion Nebula, M42, from light polluted skies. Fainter objects require
      nights of good seeing and reasonably dark skies for best filter
      performance. This filter just might allow you to see objects that you'd
      otherwise miss!
    • The Optolong Oxygen III Broadband Filter
      transmits a 25nm bandwidth of light that is centered at 500nm and
      precision blocks other transmissions, including wavelengths of light
      that are responsible for light pollution (both artificial and natural).
    • The
      Optolong 2" OIII 25nm Filter is made with Schott glass that has been
      multi-coated with an ion-assisted deposition technology to ensure
      scratch resistance and stability on the central wavelength, or CWL. The
      filter cell is made of lightweight, strong metal and is CNC machined,
      sand-blasted, black anodized, and then laser engraved. The result is a
      super thin filter cell that will produce a clear aperture of 26mm.

Quality Filter Materials:

  • Schott B260 substrate material from Germany, 2.0mm thick
  • 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

Optolong Filter Manufacturing Processes and Parameters:

  • Filter substrate is fine-optically polished to 1/4 wave and <30 parallelism over both surfaces
  • Surface quality, according to MIL-O-13830, is 60/40
  • 90% transmission at 495.9nm and 500.7nm
  • 0.1% transmission Hg at 435nm and 578nm
  • 0.1% transmission Na at 589nm
  • 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
  • Thin metal cells have a clear aperture of 26mm for 2" filters
  • Each filter comes with a plastic case with high pressure EVA case lining

Package Includes:

  • 3 x 2" OPTOLONG O-III Telescope Filter

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  • From AU Local Dispatch: AU:2-6 business days.

B: China Domestic Dispatch

  1. CountryDelivery TimeWorking Days(not including holiday)5-78-1112-1415-1920-22>22Working Days+Saturday+Sunday5-910-1516-2021-2526-30>31United KingdomRate(item arrived)9.9%63.2%19.1%3.4%4.4%RefundAustraliaRate(item arrived)21.4%50%14.3%7.2%7.1%RefundFranceRate(item arrived)10.5%28.6%43.8%10.1%7%RefundGermanyRate(item arrived)11.1%22.2%30.3%20.9%15.5%RefundCanadaRate(item arrived)0%47.1%31.4%17.6%3.9%RefundSpainRate(item arrived)3.5%25%47.9%12.9%10.7%Refund
  2. You can pay extra shipping cost to get express delivery, such as EMS, DHL or UPS. It just takes about 5-10 business days to receive order, please contact us if necessary.

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    Filed under: Eyepieces & Accessories