Baader Narrowband SII Filter CMOS f/2 Highspeed 31mm

The Baader Filters SII CMOS f/2 Highspeed 31mm is designed for CMOS cameras and fast optics up to f/2. The filter is matched to the SII emission line of 672.4 nm, crucial for capturing sulfur ionization in emission nebulae.

Thanks to Baader's advanced interference coating, the transmission remains precisely centered at the correct wavelength, without shift or vignetting. The result: razor-sharp, high-contrast narrowband images with perfect star profiles.

Application:
Ideal for RASA, HyperStar or Newton systems with f/2 to f/3 and cameras with 31 mm filter holders.
Perfect for creating Hubble palette images (SII + Hα + OIII).

Specifications:
Diameter: 31 mm (without mount)
Central wavelength: 672.4 nm
Bandwidth (FWHM): ±6.5 nm
Transmission:>90%
Type: SII CMOS f/2 High-speed
Compatible: CMOS sensors, f/2 optics
Country of origin: Germany