Filter Chroma H-alpha 5 nm 2 , mounted (SKU: CT-27002-2M) all astro filters opinie

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Chroma H-alpha 5 nm 2" Mounted (SKU: CT-27002-2M) is a narrowband filter dedicated to astrophotography of emission nebulae, designed for telescopes and cameras using the 2" standard. The 5 nm band provides effective isolation of the H-alpha signal while increasing light transmission, making it an excellent choice also for faster optical systems.

Key features

• 5 nm bandwidth – balance between high contrast and larger amount of recorded signal
• transmission in the band of approximately 99%
• hard coatings applied using the reactive magnetron sputtering method – resistant to humidity and temperature fluctuations
• additional anti-reflective coatings on the back eliminate reflections and ghosting
• Chroma Astronomy filters are parfocal to each other
• designed to work in optical systems f/4 and faster (recommended for f/3 and below)
• not intended for solar observation

Set components

• H-alpha 5 nm 2" filter in the holder – CT-27002-2M

Technical parameters

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