Filter Chroma H-beta 3 nm 1.25 , mounted (SKU: CT-27004-1.25M) all astro filters opinie

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Chroma H-beta 3 nm 1.25" Mounted (SKU: CT-27004-1.25M) is a narrowband filter designed for astrophotography of emission nebulae that glow in the hydrogen H-beta line. The narrow 3 nm bandwidth allows for effective extraction of the signal in the 486 nm range, increasing contrast and visibility of structures in deep-sky objects.

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 – resistant to changing environmental conditions
• anti-reflective coatings on the back surface minimize reflections and ghosting
• all Chroma Astronomy filters are parfocal to each other
• optimized for optical systems with f/4 aperture and slower, the 3 nm version also works well at f/3
• not suitable for observing the Sun

Set components

• H-beta 3 nm 1.25" filter in a holder – CT-27004-1.25M

Technical parameters

• type: H-beta narrowband filter for astrophotography
• diameter/frame: 1.25"
• 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)