Baader Filters SII CMOS Narrowband 50.4mm

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

It is adept at capturing the distinct features of most emission nebulae, planetary nebulae, and supernova remnants.

For those seeking to emulate the iconic imagery of the Hubble Space Telescope (HST), such as the renowned “Pillars of Creation” in the Eagle Nebula (Messier 16), the SII (es-two) or sulfur filter becomes an essential addition to your toolkit following H-alpha and OIII. Like H-alpha, the SII filter operates as a deep red filter near 672 nm. When combined, H-alpha, OIII, and SII filters contribute to achieving the characteristic Hubble-like appearance for many emission nebulae. Furthermore, conducting tri-color narrowband imaging with these three filters remains feasible even when the moon is present, ensuring your equipment remains productive.

Specifications:

Capacity:

Central Wavelength: 671.7 nm

Half-value Width: 6.5 nm

Frame: Ring

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: 50.4 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