Filter Chroma S-II 3 nm 36 mm, unmounted (SKU: CT-27009-36D) all astro filters opinie

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The Chroma S-II 3nm 36mm Unmounted (SKU: CT-27009-36D) is a narrowband filter designed for astrophotography of emission nebulae, compatible with filter wheels and unmounted systems. With its ultra-narrow 3nm bandwidth, it effectively isolates the S-II sulfur line at 672.4nm, enhancing image contrast and enabling the capture of subtle structures in deep-sky objects.

Key features

• bandwidth of 3 nm in the S-II range (approx. 672.4 nm)
• bandwidth transmission at approximately 99%
• hard coatings applied using the reactive magnetron sputtering method – durability and resistance to environmental factors
• anti-reflective coatings on the back surface reduce reflections and ghosting
• all Chroma Astronomy filters are parfocal to each other
• optimized for f/4 and slower optical systems, the 3nm version also performs well at f/3
• the filter is not intended for observing the Sun

Set components

• S-II filter 3 nm 36 mm unmounted – CT-27009-36D

Technical parameters

• type: S-II narrowband filter for astrophotography
• diameter: 36 mm, unframed
• bandwidth: 3 nm
• central wavelength (CWL): approx. 672.4 nm
• transmission: approx. 99%
• optical substrate: 3.0 mm thick glass
• coating technology: reactive magnetron sputtering (hard coatings)
• coating construction: main layer on the front side, AR coatings on the back side
• Transmitted wavefront accuracy: better than 0.25 waves/inch
• parfocal: yes (with other Chroma Astronomy filters)
• production: USA (Vermont)