Filter Chroma H-beta 5 nm 1.25 , mounted (SKU: CT-27005-1.25M) all astro filters opinie

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Chroma H-beta 5 nm 1.25" Mounted (SKU: CT-27005-1.25M) is a narrowband filter for astrophotography of emission nebulae, enabling the recording of hydrogen H-beta emission at a wavelength of 486 nm. The 5 nm band provides a good balance between selectivity and transmission, making the filter a universal solution also for work in faster optical systems.

Key features

• bandwidth of 5 nm for the H-beta line (approx. 486 nm)
• transmission in the band of 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
• designed for use in 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 1.25" filter in a holder – CT-27005-1.25M

Technical parameters

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