Chroma Filters SII 36mm unmounted, 3nm (70109)

The narrowband SII 3nm filter is designed for astrophotography, allowing light at a wavelength of 672nm to pass through while blocking all other wavelengths. With its narrow 3nm bandpass, this filter is ideal for capturing high-contrast images of emission nebulae, planetary nebulae, and supernova remnants. It is an essential tool for achieving the iconic "Hubble Space Telescope" look, as seen in images like the "Pillars of Creation" in the Eagle Nebula (Messier 16).

When used alongside H-alpha and OIII filters, the SII filter enables tri-color narrowband imaging. This technique allows astrophotographers to capture stunning deep-sky images even under moonlit skies, ensuring your equipment remains productive regardless of light conditions.

Specifications:

Capacity:

• Connection (to the Telescope): 36mm

• Frame: Unmounted

• Mount Material: Unmounted

• Central Wavelength (nm): 672

• Half-Value Width (nm): 3

General:

• Type: Filters

• Type of Build: Line Filter

Area of Application:

• Useful for Photographs: Yes

• Nebulae & Galaxies: No

• Planetary Nebulae: Yes

• Supernova Remains: Yes