Baader OIII CMOS f/2 Highspeed 1.25" This 1.25-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 1.25" · Specifications checked against manufacturer data on 2026-11-04
This 1.25-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.
70914
Technische Daten
Anwendung
Imaging with CMOS or CCD cameras
Vergütung
Reflex-Blocker hard coating; Life-Coat sealed edges
EAN-Barcode
4047825047267
Kantenbehandlung
Blackened edges; telescope-facing black outer-rim indicator
Emissionsband
O-III
Filterserie
f/2 Highspeed, Precision Grade; CMOS-optimised
Filterformat
1.25-inch
FWHM (nm)
6.5
Glasdicke (mm)
2
Nettogewicht laut Hersteller (kg)
0.01
Herstellerteilenummer
2961225
Wellenlänge laut Hersteller (nm)
500.7
Modell
Baader OIII CMOS f/2 Highspeed 1.25"
Montage
Mounted, 5.5 mm ULP cell
Menge
1
Empfohlene Öffnungsverhältnisse
f/3.4 and faster
Form
Round
Oberflächenbeschaffenheit
Plane-optically polished
Besondere Bestellnummern
Hersteller-Teilenummer (MPN)
2961225
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Baader OIII CMOS f/2 Highspeed 1.25" This 1.25-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 1.25" · Specifications checked against manufacturer data on 2026-11-04
