Filter Chroma H-alpha 3 nm 50 mm, unmounted (SKU: CT-27001-50D) all astro filters opinie

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The Chroma H-alpha 3 nm 50mm Unmounted (SKU: CT-27001-50D) is a narrowband filter designed for demanding astrophotography systems. Its very narrow passband allows for the precise extraction of H-alpha emission, significantly improving contrast and revealing the structure of emission nebulae.

Key features

• 3 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, characterized by high durability and stability
• additional anti-reflective coatings on the back reduce reflections and ghosting
• all Chroma Astronomy filters are parfocal to each other
• optimized for use in f/4 and slower optical systems; 3nm version also adapted to f/3 systems
• not suitable for observing the Sun

Set components

• H-alpha filter 3 nm 50 mm unmounted – CT-27001-50D

Technical parameters

• type: narrowband H-alpha filter for astrophotography
• diameter: 50 mm, unframed
• 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)
• production: USA (Vermont)