Baader Filters SII CMOS Ultra-Narrowband 65x65mm (70892)

The narrowband S-II 7nm filter is designed for nebula photography, allowing light transmission at a wavelength of 672nm with a bandpass of 3nm. It is well-suited for imaging most emission nebulae, planetary nebulae, and supernova remnants.

If you're aiming to replicate the iconic look of Hubble Space Telescope (HST) images—such as the famous "Pillars of Creation" in the Eagle Nebula (Messier 16)—the SII filter is an excellent addition to your setup after H-alpha (H-a) and OIII filters. Like the H-a filter, the SII (sulfur) filter operates in the deep red spectrum near 672nm. Together, H-a, OIII, and SII filters create the "Hubble look" for many emission nebulae. Additionally, these filters enable tri-color narrowband imaging even during moonlit nights, ensuring your equipment remains productive without long delays.

Specifications

• Capacity

  • Central wavelength: 671.7nm

  • Half-value width: 4nm

• Frame

  • Mount material: Aluminium

  • Coating: Reflex-Blocker™

• Compatibility

  • Suitable for systems with f/10 to f/3.5

  • Filter thickness: 2mm

  • Filter size: 65 x 65mm

• General Information

  • Type: Filters

  • Build type: Line filter

  • Series: Ultra-Narrowband

• Applications

  • Useful for photography: Yes

  • Visually useful: No

  • Twin stars: No

  • Moon & planets: No

  • Nebulae & galaxies: Yes