Filter Chroma H-beta 5 nm 50 mm, unmounted (SKU: CT-27005-50D) all astro filters opinie

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The Chroma H-beta 5 nm 50 mm Unmounted (SKU: CT-27005-50D) is a large format narrowband filter designed for astrophotography of H-beta emission nebulae. The 5 nm band effectively isolates emission at 486 nm while providing greater light transmission than narrower 3 nm filters, making it an excellent choice for faster optical systems.

Key features

• 5 nm bandwidth tuned to the H-beta line (approx. 486 nm)
• bandwidth transmission at approximately 99%
• hard coatings applied using the reactive magnetron sputtering method – very 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
• optimized for use in f/4 and faster optical systems, also recommended for f/3
• not intended for solar observation

Set components

• H-beta 5 nm filter 50 mm unmounted – CT-27005-50D

Technical parameters

• type: H-beta narrowband filter for astrophotography
• diameter: 50 mm, unframed
• bandwidth: 5 nm
• central wavelength (CWL): approx. 486 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)