Filter Chroma H-alpha 5 nm 1.25 , mounted (SKU: CT-27002-1.25M) all astro filters opinie

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The Chroma H-alpha 5 nm 1.25" Mounted (SKU: CT-27002-1.25M) is a narrowband filter designed for astrophotography of emission nebulae. The wider 5 nm bandwidth compared to the 3 nm version facilitates work in faster optical systems and increases light transmission while maintaining high selectivity towards the H-alpha line.

Key features

• 5 nm bandwidth – a compromise between selectivity and high transmission
• bandwidth transmission at approximately 99%
• hard coatings applied using the reactive magnetron sputtering method – high resistance to moisture and temperature changes
• anti-reflective coatings on the back eliminate reflections and improve transmission
• Chroma Astronomy filters are parfocal to each other
• suitable for use in systems with an aperture of f/4 and faster (recommended for f/3 and below)
• not suitable for observing the Sun

Set components

• 5 nm 1.25" H-alpha filter in the holder – CT-27002-1.25M

Technical parameters

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