Filter Chroma H-beta 3 nm 31 mm, unmounted (SKU: CT-27004-31D) all astro filters opinie

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The Chroma H-beta 3 nm 31 mm Unmounted (SKU: CT-27004-31D) is a narrowband filter for astrophotography of emission nebulae, designed for use with filter wheels and mountless systems. The narrow 3 nm bandwidth allows for precise isolation of the H-beta line at 486 nm, increasing image contrast and detail.

Key features

• 3 nm bandwidth in the H-beta line (approx. 486 nm)
• bandwidth transmission at approximately 99%
• hard coatings applied using the reactive magnetron sputtering method – high durability and resistance to changing conditions
• 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 slower optical systems, the 3nm version also works at f/3
• the filter is not intended for observing the Sun

Set components

• H-beta 3 nm filter 31 mm unmounted – CT-27004-31D

Technical parameters

• type: H-beta narrowband filter for astrophotography
• diameter: 31 mm, unframed
• bandwidth: 3 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)