Filter Chroma S-II 5 nm 31 mm, unmounted (SKU: CT-27010-31D) all astro filters opinie

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The Chroma S-II 5 nm 31 mm Unmounted (SKU: CT-27010-31D) is a narrowband filter designed for astrophotography of emission nebulae, designed for mounting in filter wheels and mountless systems. The 5 nm bandwidth effectively isolates the S-II sulfur line at 672.4 nm, offering high contrast and greater light transmission than narrower 3 nm filters.

Key features

• 5 nm bandwidth concentrated on the S-II line (approx. 672.4 nm)
• bandwidth transmission at approximately 99%
• hard coatings applied using the reactive magnetron sputtering method – high durability and resistance to external factors
• anti-reflective coatings on the back surface reduce reflections and ghosting
• all Chroma Astronomy filters are parfocal to each other
• designed for optical systems f/4 and faster, also works well at f/3
• the filter is not suitable for observing the Sun

Set components

• S-II filter 5 nm 31 mm unmounted – CT-27010-31D

Technical parameters

• type: S-II narrowband filter for astrophotography
• diameter: 31 mm, unframed
• bandwidth: 5 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)