Cloud Break Optics

OIII 6.0 Filter

OIII 6.0 Filter - Main image
OIII 6.0 Filter - View 2OIII 6.0 Filter - View 3OIII 6.0 Filter - View 4OIII 6.0 Filter - View 5OIII 6.0 Filter - View 6
$269.09 $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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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.4 / 5 · 5 reviews)

Robert P. ★★★★★

After months of fighting light pollution on the Veil Nebula, this filter's narrow 6nm bandpass made the OIII signal pop like never before. The measured transmission value of 98% clearly made a difference in my total exposure time.

Daniel ★★★★★

First light with this filter showed the Veil Nebula's filamentary structure with a clarity I've never seen before — those 6nm bandwidths really do cut through light pollution. It threaded onto my 2-inch eyepiece without any binding.

Sophia ★★★★★

Finally got the 6.0nm bandwidth version and it really pulls out those OIII details in the Veil, even from my Bortle 7 backyard. The measured value matches the spec sheet, so no disappointments there.

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