Filter Chroma H-alpha 3 nm 2 , mounted (SKU: CT-27001-2M) all astro filters opinie

1831 EUR price without VAT: 1489 EUR Shop online: ● on request  Shop in Warsaw (qty): ● on request  Shop in Chorzow (qty): ● on request

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Chroma H-alpha 3 nm 2" Mounted (SKU: CT-27001-2M) is a high-quality narrowband filter designed for astrophotography of emission objects. Thanks to its very narrow passband, it allows for precise separation of the hydrogen H-alpha line, which increases image contrast even in areas with high light pollution.

Key features

• 3 nm bandwidth – perfect separation of H-alpha lines (approx. 656 nm)
• transmission in the band of approximately 99%
• hard coatings applied using the reactive magnetron sputtering method, resistant to moisture and temperature changes
• additional anti-reflective coatings on the back eliminate reflections and ghosting
• Chroma Astronomy filters are parfocal to each other
• optimized for operation in f/4 and slower systems; the 3nm version also enables efficient operation at f/3
• not intended for solar observation

Set components

• H-alpha 3 nm 2" filter in the holder – CT-27001-2M

Technical parameters

• type: narrowband H-alpha filter for astrophotography
• bandwidth: 3 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)
• diameter/fitting: 2"
• production: USA (Vermont)