Baader OIII CMOS f/2 Highspeed 2" This 2-inch O-III filter is the 6.5 nm f/2 Highspeed version from Baader’s CMOS-optimised Precision Grade range. It isolates the O-III emission band for narrowband imaging, with the manufacturer’s wavelength reference at 500.7 nm.
Manufacturer model: Baader OIII CMOS f/2 Highspeed 2" · Specifications checked against manufacturer data on 2026-11-04
This 2-inch O-III filter is the 6.5 nm f/2 Highspeed version from Baader’s CMOS-optimised Precision Grade range. It isolates the O-III emission band for narrowband imaging, with the manufacturer’s wavelength reference at 500.7 nm.
Fast optical systems
The filter’s bandpass is designed for the incidence angles found in very fast optics, including f/2 Celestron RASA systems. Baader recommends this family for f/3.4 and faster optical systems. It is distinct from the standard slower-system narrowband filters and the narrower Ultra-Highspeed family.
Glass, cell and coatings
The filter uses 2 mm glass in a 5.5 mm ULP mounted cell. Reflex-Blocker hard coatings, plane-optical polishing, sealed coating edges and blackened edges are specified. The outer-rim indicator marks the telescope-facing side.
Imaging configuration
This is one filter, rather than an H-alpha/O-III/S-II set. The coating generation is optimised for CMOS cameras and is also suitable for CCD imaging. Use a holder that accepts the stated filter format and cell height.
Exact manufacturer f/2 Highspeed 6.5 nm SKU matched by band and mounted size. Not the 3.5/4 nm Ultra-Highspeed model. Wavelength follows the exact manufacturer variant table, including S-II at 671.7 nm; no alternative line-centre value is silently substituted.
70917
Fiche technique
Application
Imaging with CMOS or CCD cameras
Traitement
Reflex-Blocker hard coating; Life-Coat sealed edges
Code-barres EAN
4047825047298
Traitement des bords
Blackened edges; telescope-facing black outer-rim indicator
Bande d'émission
O-III
Famille de filtres
f/2 Highspeed, Precision Grade; CMOS-optimised
Format de filtre
2-inch
FWHM (nm)
6.5
Épaisseur du verre (mm)
2
Poids net selon le fabricant (kg)
0.01
Référence fabricant
2961228
Longueur d'onde selon le fabricant (nm)
500.7
Modèle
Baader OIII CMOS f/2 Highspeed 2"
Montage
Mounted, 5.5 mm ULP cell
Quantité
1
Rapports F/D recommandés
f/3.4 and faster
Forme
Round
État de surface
Plane-optically polished
Références spécifiques
MPN
2961228
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Baader OIII CMOS f/2 Highspeed 2" This 2-inch O-III filter is the 6.5 nm f/2 Highspeed version from Baader’s CMOS-optimised Precision Grade range. It isolates the O-III emission band for narrowband imaging, with the manufacturer’s wavelength reference at 500.7 nm.
Manufacturer model: Baader OIII CMOS f/2 Highspeed 2" · Specifications checked against manufacturer data on 2026-11-04
