Filter Chroma S-II 3 nm 2 , mounted (SKU: CT-27009-2M) all astro filters opinie

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Chroma S-II 3 nm 2" Mounted (SKU: CT-27009-2M) is a narrowband filter designed for astrophotography of emission nebulae glowing in the S-II sulfur line. Thanks to its very narrow 3 nm bandwidth, it effectively isolates the emission at 672.4 nm, which increases contrast and allows recording details of structures even in light pollution conditions.

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 optical stability
• anti-reflective coatings on the back surface eliminate reflections and ghosting
• all Chroma Astronomy filters are parfocal to each other
• optimized for use in 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 3 nm 2" filter in the holder – CT-27009-2M

Technical parameters

• type: S-II narrowband filter for astrophotography
• diameter/fitting: 2"
• 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)