Optolong S-II 6.5nm 2.0inch imaging narrowband filter
The Optolong S-II 6.5nm 2.0-inch Imaging Narrowband Filter is a specialized astrophotography filter designed to capture images of celestial objects that emit light at the ionized sulfur (S-II) wavelength. Similar to other narrowband filters, the S-II 6.5nm filter has a narrow passband of 6.5 nanometers, allowing only a small range of wavelengths centered around the S-II emission line to pass through while blocking out most other wavelengths of light.
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