Baader Filters SII CMOS Narrowband 65x65mm

SII Filter: The narrowband S-II 7nm filter allows light at a 672nm wavelength with a bandpass of 3nm, tailored for nebula photography.

It proves effective for capturing the distinct features of most emission nebulae, planetary nebulae, and supernova remnants.

For those seeking to achieve the aesthetic of Hubble Space Telescope (HST) images, such as the renowned “Pillars of Creation” in the Eagle Nebula (Messier 16), the SII (es-two) or sulfur filter is the next essential addition to your collection after H-alpha and OIII. Operating as a deep red filter near 672 nm, similar to H-alpha, the SII filter, combined with H-alpha and OIII filters, creates that signature Hubble-like appearance for many emission nebulae. Additionally, performing tri-color narrowband imaging with these three filters remains possible even with the moon present, ensuring your equipment remains active.

Specifications:

Capacity:

Central Wavelength: 671.7 nm

Half-value Width: 6.5 nm

Frame: Frames

Mount Material: Aluminum

Coating of Optical System: Reflex-Blocker™

Suitable for apertures ranging from f/10 to f/3.5

Filter Thickness: 2 mm

Filter Size: 65 x 65 mm

General:

Type: Filters

Type of Build: Line filter

Series: Narrowband

Area of Application:

Useful for Photographs: Yes

Visually Useful: No

Twin Stars: No

Moon & Planets: No

Nebulae & Galaxies: Yes