Filter Chroma H-alpha 5 nm 50 mm, unmounted (SKU: CT-27002-50D) all astro filters opinie

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The Chroma H-alpha 5 nm 50 mm Unmounted (SKU: CT-27002-50D) is a narrowband filter used in advanced astrophotography of emission nebulae. Its 5 nm bandwidth effectively isolates the H-alpha signal while increasing light transmission, making it a suitable choice for faster optics as well.

Key features

• 5 nm band optimized for the H-alpha line (approx. 656 nm)
• transmission in the band of approximately 99%
• hard coatings applied using the reactive magnetron sputtering method – very high durability and stability
• anti-reflective coatings on the back surface minimize 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
• not suitable for observing the Sun

Set components

• H-alpha filter 5 nm 50 mm unmounted – CT-27002-50D

Technical parameters

• type: narrowband H-alpha filter for astrophotography
• diameter: 50 mm, unframed
• bandwidth: 5 nm
• central wavelength (CWL): approx. 656 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)