Filter Chroma H-beta 3 nm 2 , mounted (SKU: CT-27004-2M) all astro filters opinie

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Chroma H-beta 3 nm 2" mounted (SKU: CT-27004-2M) is a narrowband filter dedicated to astrophotography of emission nebulae emitting in the H-beta line. Thanks to the narrow bandwidth of 3 nm, it allows for effective separation of hydrogen emission at a wavelength of 486 nm, increasing the contrast and detail of images of deep sky objects.

Key features

• 3 nm band tuned to the H-beta line (approx. 486 nm)
• transmission in the band of approximately 99%
• hard coatings applied using the reactive magnetron sputtering method – durable and resistant to changing environmental 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 suitable for observing the Sun

Set components

• H-beta 3 nm 2" filter in the holder – CT-27004-2M

Technical parameters

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