Cloud Break Optics

OIII 6.0nm Filter

OIII 6.0nm Filter - Main image
OIII 6.0nm Filter - View 2OIII 6.0nm Filter - View 3OIII 6.0nm Filter - View 4OIII 6.0nm Filter - View 5OIII 6.0nm Filter - View 6
$257.72 $379 In stock

Category: Filters

The IDAS Oxygen III filter is designed to isolate the OIII emission bands for best signal-to-noise performance for a wide range of telescope designs.

Features include:

  • 6.0 +/- 0.2nm (Measured value)
  • 98% transmission rate (Measured value)
  • Flat top, which maximizes the transmission even for fast optics
  • Out-of-band blocking: 300-1300nm
  • Configurations:
    • 2.5mm or 3.0mm thickness options
    • 3 mount sizes - 48mm, 52mm & 50.8 (for filter wheels)
  • Each filter is individually inspected for quality. The filter response is plotted and provided with each unit.
  • Made in Japan
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Customer Reviews (5.0 / 5 · 5 reviews)

Richard ★★★★★

I’ve used this on my f/5 Newtonian under Bortle 5 skies, and the contrast on the Veil Nebula was incredible—the 98% transmission really pulls out those faint OIII details. Nebulosity in the background just disappeared compared to my wider filter.

Victoria ★★★★★

The measured 6nm bandwidth really cuts through light pollution—I could clearly see the Veil Nebula's delicate filaments from my backyard. Oxygen III signal just pops against the sky background now.

Michael E. ★★★★★

I was blown away by how much detail popped out in the Veil Nebula with this filter—the 6.0nm bandwidth really cuts through the skyglow. The measured value matching the spec gives me confidence it's doing exactly what it should.

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