The ZWO S II 31mm Unmounted Narrowband Filter is an essential tool for astrophotographers aiming to capture intricate details in narrowband imaging. Designed to isolate Sulphur II light at a wavelength of 672.4nm, this filter excels in highlighting the subtle structures of emission nebulae and other deep-sky objects. Its unmounted design fits seamlessly into 31mm filter holders, ensuring smooth integration with ZWO filter wheels and various astrophotography setups.

When used with a monochrome camera, the S II filter is a key component for creating high-contrast images, especially as part of a three-band narrowband setup alongside Hydrogen-alpha (Hα) and Oxygen III (OIII) filters. By targeting specific wavelengths and reducing light pollution, this filter enhances the quality of your astrophotography, allowing for detailed and visually striking false-colour images.

Whether you're imaging the fine structures of a nebula or building a composite image that reveals the intricacies of deep space, the ZWO S II 31mm Filter provides the precision and clarity you need for outstanding results.

About ZWO Optical

Established in 2011, ZWO Optical is a fast-growing global astroimaging camera powerhouse based in Suzhou, China. Known for its iconic ZWO ASI 120MM Monochrome CMOS Camera, the first-ever planetary CMOS camera to beat a CCD in the early 2010s, ZWO has  pioneered new astroimaging technology with revolutionary new features, including USB 3,0, cooled systems, ADC and more. Today, ZWO Cameras is known by every passionate astrophotographer and is available in over 25 countries world-wide. 

Product Code: SII7nm1.25