Filter Chroma H-beta 5 nm 2 , mounted (SKU: CT-27005-2M) all astro filters opinie

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The Chroma H-beta 5 nm 2" Mounted (SKU: CT-27005-2M) is a narrowband filter dedicated to astrophotography of emission nebulae. Thanks to its 5 nm bandwidth, it effectively isolates the H-beta line at 486 nm, providing high image contrast, while also offering greater light transmission than narrower 3 nm filters, making it a good choice also for faster optical systems.

Key features

• 5 nm bandwidth in the H-beta range (approx. 486 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
• designed for optical systems f/4 and faster, also recommended for f/3
• the filter is not suitable for observing the Sun

Set components

• H-beta 5 nm 2" filter in the holder – CT-27005-2M

Technical parameters

• type: H-beta narrowband filter for astrophotography
• diameter/fitting: 2"
• 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)