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Baader Planetarium O-III 2 inch 9nm Super-G CMOS Filter in black metal mount

Baader Planetarium

Baader Planetarium O-III 2" 9nm Super-G CMOS Filter optic

SKU CH-WZ8M-G8S07

Isolates the O-III emission line at 500.7 nm with a 9 nm bandpass for high-contrast nebula imaging

  • Narrow 9 nm bandwidth isolates O-III line for high-contrast nebulae images
  • 97 % transmission at 500.7 nm captures nearly all nebula light
  • Super-G CMOS coating optimised for 502 nm central wavelength boosts light capture
  • Reflex-Blocker coating cuts internal reflections and halos for sharper detail
  • Works at any focal ratio from f/1.8 to f/12 with DSLR or OSC cameras

Ideal for nebula imaging

The Baader Planetarium O-III 2" 9nm Super-G CMOS Filter isolates the 500.7 nm emission line of doubly ionised oxygen. It is designed for astronomers capturing planetary nebulae and supernova remnants. The 9 nm half bandwidth provides high contrast against the night sky.

Consistent narrow-band performance

The filter maintains a broad transmission plateau with steep slopes across its operating range. At 97 % transmission the central wavelength passes efficiently even during long integrations. It functions reliably at any focal ratio from f/1.8 to f/12 without shift.

Stable thermal behaviour

The Reflex-Blocker coating suppresses internal reflections and halos that can degrade stacked frames. The 6 mm LPFC cell and 2 mm substrate thickness resist flexure during temperature changes. High transmission at 502 nm reduces the exposure time needed for faint targets.

Highlights

  • Narrow 9 nm bandwidth isolates O-III line for high-contrast nebulae images
  • 97 % transmission at 500.7 nm captures nearly all nebula light
  • Super-G CMOS coating optimised for 502 nm central wavelength boosts light capture
  • Reflex-Blocker coating cuts internal reflections and halos for sharper detail
  • Works at any focal ratio from f/1.8 to f/12 with DSLR or OSC cameras

Specifications

No published specifications for this item yet.

Questions about this item

Does the 9 nm FWHM filter generate any heat or consume power during long imaging sessions?

No, the filter is a passive optical component with no electronics, so it produces no heat and draws no power.

What telescope thread or adapter is required to mount the 2" LPFC 6 mm cell?

It fits any standard 2" filter thread on a telescope focuser, diagonal, or camera nosepiece; no proprietary adapter is needed.

Will the 9 nm bandpass work with my older f/10 Schmidt-Cassegrain without shifting the 500.7 nm O-III line?

Yes, the filter is rated for focal ratios from f/1.8 to f/12, so an f/10 system keeps the line centred and maintains 97 % transmission.

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