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Orion OIII Extra Narrowband Filter - 1.25" Round Mounted

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  • Astrophotographic 1.25-inch filter allows high-contrast imaging even in areas with strong light pollution
  • Filter passes light at 500.7 nm wavelength (O-III line) with a bandpass of 7 nm for pleasing results
  • Very high 90-percent transmission of O-III light for sharp astrophotos
  • Filter made from high-grade glass with dichroic interference and anti-reflection coatings; size 1.25-inch
  • Use with S-II and H-alpha extra-narrowband imaging filters for tri-color CCD astrophotography



Orion OIII Extra Narrowband Filter - 1.25" Round Mounted

This is 1.25-Inch OIII Extra Narrowband Filter from Orion means that you can now capture dramatic Hubble-like CCD images of emission nebulas from the heart of the city or under a full Moon. 

By imaging with the extra-narrowband filters, (S-II, O-III, and H-alpha) are specialized filters which 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 tri-color images from even grossly light-polluted skies.

The O-III filter passes light at the 500.7 nm wavelength (the Oxygen-III line) with very high 90-percent transmission and a bandpass of 7 nm. It complements the Orion H-alpha (OR-5587) and Sulfur-II (OR-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-inch filters are made from high-grade glass and feature vacuum-deposited dichroic interference coatings and anti-reflection 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-inch 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
WarrantyOrion Limited Warranty