Baader SII CMOS f/2 Highspeed 2" This 2-inch S-II filter is the 6.5 nm f/2 Highspeed version from Baader’s CMOS-optimised Precision Grade range. It isolates the S-II emission band for narrowband imaging, with the manufacturer’s wavelength reference at 671.7 nm.
Manufacturer model: Baader SII CMOS f/2 Highspeed 2" · Specifications checked against manufacturer data on 2026-11-04
This 2-inch S-II filter is the 6.5 nm f/2 Highspeed version from Baader’s CMOS-optimised Precision Grade range. It isolates the S-II emission band for narrowband imaging, with the manufacturer’s wavelength reference at 671.7 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.
70924
Scheda tecnica
Applicazione
Imaging with CMOS or CCD cameras
Trattamento
Reflex-Blocker hard coating; Life-Coat sealed edges
Codice a barre EAN
4047825047502
Trattamento dei bordi
Blackened edges; telescope-facing black outer-rim indicator
Banda di emissione
S-II
Famiglia di filtri
f/2 Highspeed, Precision Grade; CMOS-optimised
Formato filtro
2-inch
FWHM (nm)
6.5
Spessore del vetro (mm)
2
Peso netto dichiarato (kg)
0.01
Codice produttore
2961303
Lunghezza d'onda dichiarata (nm)
671.7
Modello
Baader SII CMOS f/2 Highspeed 2"
Montaggio
Mounted, 5.5 mm ULP cell
Quantità
1
Rapporti focali consigliati
f/3.4 and faster
Forma
Round
Finitura superficiale
Plane-optically polished
Riferimenti Specifici
MPN
2961303
Hai usato questo prodotto? Condividi la tua esperienza con altri astronomi.
Commenti (0)
Ancora nessuna recensione da parte degli utenti.
Non è stato possibile inviare il tuo giudizio sulla recensione
Segnala commento
Sei sicuro di voler segnalare questo commento?
Segnalazione inviata
La tua segnalazione è stata inviata e sarà esaminata da un moderatore.
Non è stato possibile inviare la tua segnalazione
Scrivi la tua recensione
Recensione inviata
Il tuo commento è stato acquisito e sarà disponibile dopo l'approvazione da parte di un moderatore.
Baader SII CMOS f/2 Highspeed 2" This 2-inch S-II filter is the 6.5 nm f/2 Highspeed version from Baader’s CMOS-optimised Precision Grade range. It isolates the S-II emission band for narrowband imaging, with the manufacturer’s wavelength reference at 671.7 nm.
Manufacturer model: Baader SII CMOS f/2 Highspeed 2" · Specifications checked against manufacturer data on 2026-11-04
