<br />Delivery acc. to manufacturer: 15.10.2020 (69 days)

Delivery acc. to manufacturer: 15.10.2020 (69 days)

Baader 2" O-III filter - 10 nm Narrowband - more contrast

138,66 EUR
excl. VAT
excl. 4,65 € Shipping costs


2" O-III Filter - 10 nm Narrowband

For extreme contrast enhancement when observing nebulae

Baader [O III] filter 2 inch

The O-III filter is especially useful for planetary nebulae. In the [O III] line, they show their most interesting structures. But [O III] regions are also embedded in other gas nebulae. So an [O III] filter can show completely different details than a UHC filter or no filter.

The Baader [O III] filter is very narrow banded with only 10 nm FWHM. We recommend it for apertures above 200 mm. Below, only low magnification is possible. It is a good addition to the broad band UHC-S filter from Baader.

Transmission curve:

Baader [O III] filter transmission curve

The transmission curve shows a small 10 nm FWHM band - exactly on the [O III] line at 501 nm.

With the [O III] filter, even under worse stray light conditions in big cities, successful observations are possible. The background remains black also at big exit pupils.

The filter is dielectrically coated and aging-resistant, robust and scratch-proof. Highest image quality is guaranteed by plane-optically polished surfaces.


  • Plane-optically polished surfaces
  • Hard-multicoated
  • 10nm FWHM band on the [O III] line at 501 nm
  • 2" filter thread
  • Aluminum cell
  • Cell height: 6 mm without external thread, 8 mm with M48 external thread
  • Knurled edge
  • Substrate 2 mm thick

Scope of delivery:

Filter in plastic box

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