Filter Chroma S-II 5 nm 2 , mounted (SKU: CT-27010-2M) all astro filters opinie

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Chroma S-II 5 nm 2" Mounted (SKU: CT-27010-2M) is a narrowband filter designed for astrophotography of emission nebulae glowing in the S-II sulfur line. Thanks to its 5 nm bandwidth, it effectively isolates the signal at 672.4 nm, providing high contrast and greater light transmission than narrower 3 nm filters. This makes it especially useful in faster optical systems.

Key features

• bandwidth of 5 nm in the S-II range (approx. 672.4 nm)
• bandwidth transmission at approximately 99%
• hard coatings applied using the reactive magnetron sputtering method – high durability and spectral stability
• anti-reflective coatings on the back surface reduce reflections and ghosting
• all Chroma Astronomy filters are parfocal to each other
• designed to work in optical systems f/4 and faster, also compatible with f/3 systems
• the filter is not intended for observing the Sun

Set components

• S-II 5 nm 2" filter in the holder – CT-27010-2M

Technical parameters

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