Used Orion OIII Extra Narrowband Filter - 1.25" Round Mounted - SOLD

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  • $89.00
  • Regular price $129.00

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  • This is a used filter in excellent condition
  • Astrophotographic 1.25" filter allows high-contrast imaging even in areas with strong light pollution
  • Filter passes light at 500.7nm wavelength (O-III line) with a bandpass of 7nm for pleasing results
  • Very high 90% transmission of O-III light for sharp astrophotos
  • Filter made from high-grade glass with dichroic interference and antireflection coatings; size 1.25
  • Use with S-II and H-alpha extra-narrowband imaging filters for tricolor CCD astrophotography


Used Orion OIII Extra Narrowband Filter - 1.25" Round Mounted - SOLD

Now you can capture dramatic Hubble-like CCD images of emission nebulas from the heart of the city or under a full Moon. How? By imaging with S-II, O-III, and H-alpha extra-narrowband filters. These specialized filters transmit only the specific wavelengths of light that are important in emission nebula, while blocking out all other light, whether artificial or natural - from street lamps, the Moon, you name it! The result: high-contrast tricolor images from even grossly light-polluted skies.

The O-III filter passes light at the 500.7nm wavelength (the Oxygen-III line) with very high 90% transmission and a bandpass of 7nm. It complements the Orion H-alpha (5587) and Sulfur-II (5579) extra-narrowband filters, which together allow advanced tricolor imaging of emission nebula with the StarShoot Deep Space Monochrome CCD Imaging Camera or other monochrome CCD cameras.

These 1.25" filters are made from high-grade glass and feature vacuum-deposited dichroic interference coatings and antireflection coatings. All three are parfocal, meaning no refocusing is needed when switching among them. Each filter is held in an anodized aluminum cell that is threaded to fit a standard CCD camera 1.25" nosepiece or the Orion Multiple Filter Wheel.

Images taken with extra-narrowband filters typically look much different from those acquired using standard "true color" (RGB) methods. Rather than rendering an image in its "natural" color, the extra-narrowband filters provide a visual representation of the elemental makeup of a nebula, highlighting with assigned colors the areas where the light derives predominantly from either Sulfur-II, Oxygen-III, or Hydrogen-alpha ions. This is the approach used by astronomers for many of the nebula pictures taken with the Hubble Space Telescope. The extra-narrowband "false color" images, while beautiful, also reveal much about a the chemical composition of the nebula and its various features.

So if you're ready to go beyond RGB imaging and capture your favorite nebulas in a revealing new light - no matter how light-polluted your skies -- add our O-III (and S-II and H-alpha) Extra-Narrowband filter to your imaging arsenal! Includes protective plastic case.


Accessory TypeOxygen III
Filter MountedMounted
Filter Side Adapter SizeRound
Warranty90 Day


  • 1.25" mounted Orion OIII imaging filter
  • Case, box and spec sheet


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