Filter Chroma H-alpha 5 nm 31 mm, unmounted (SKU: CT-27002-31D) all astro filters opinie

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The Chroma H-alpha 5 nm 31 mm Unmounted (SKU: CT-27002-31D) is a narrowband filter designed for astrophotography of emission nebulae. With a wider 5 nm bandwidth than the 3 nm version, it provides greater light transmission and is better suited for faster optics while maintaining high H-alpha selectivity.

Key features

• 5 nm bandwidth, 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 – durable and resistant to weather conditions
• anti-reflective coatings on the back surface eliminate reflections and ghosting
• all Chroma Astronomy filters are parfocal to each other
• excellent choice for optical systems f/4 and faster (also recommended for f/3)
• not suitable for observing the Sun

Set components

• H-alpha filter 5 nm 31 mm unmounted – CT-27002-31D

Technical parameters

• type: narrowband H-alpha filter for astrophotography
• diameter: 31 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)