Chroma Technology SII Filter

The SII filter is designed to isolate the specific light emitted by ionized sulfur atoms in emission nebulae. It is a critical component for creating Hubble Palette images, allowing you to map sulfur data to specific color channels for high-contrast, professional-grade results.

Yes, this filter is a standard 50.8mm (2-inch) size with a threaded insert style, making it compatible with most standard imaging trains, filter wheels, and filter drawers.

An 8 nm bandwidth is narrow enough to effectively block light pollution and unwanted wavelengths while still allowing enough signal through for efficient exposure times. It provides the precision needed to capture distinct structural details in nebulae without requiring excessively long integration times.

No, these filters are built for longevity. They feature sputtered hard coatings on both surfaces, which makes them highly resistant to environmental stressors like humidity and temperature fluctuations, unlike laminated filters that can delaminate over time.

The filter is designed with anti-reflective coatings on the rear surface specifically to minimize ghosting and back reflections, ensuring your final images remain clean and high-contrast.