in stock
in stock

Baader O III nebular filter - 1.25" - 10 nm HBW

79,83 EUR
excl. VAT
excl. 4,65 € Shipping costs


1.25" O-III Filter - 10 nm Narrowband

For extreme contrast enhancement when observing nebulae

Baader [O III] filter 1.25 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 200mm. Below, only low magnification is possible. It is a good addition to the broad band UHC-S filter from Baader.

Filter 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
  • 10 nm FWHM band on the [O III] line at 501 nm
  • 1.25" filter thread
  • Aluminum cell
  • Knurled edge
  • Substrate 2 mm thick

Scope of delivery:

Filter in plastic box

up ...

E-Mail: • Phone: +49 (0)89-9922875-0
Parse Time: 0,658s
This shop uses cookies that are necessary for its correct function and, if necessary, also uses cookies from third party providers. By using our shop you agree to the use of cookies.

OKMore info ......
Please note that only latin characters, numbers and common special characters can be entered.