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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.

How it compares

Measured against everything we stock in Binoculars, Scopes & Sights, at today’s prices. Recalculated every night.

Price $141.99
Pricier than about 60% of the 1,401 comparable items (median $93.99).

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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