Filter Chroma H-alpha 3 nm 36 mm, unmounted (SKU: CT-27001-36D) all astro filters opinie

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The Chroma H-alpha 3 nm 36 mm unmounted (SKU: CT-27001-36D) is a narrowband filter designed for astrophotography of emission nebulae. Its very narrow 3 nm bandwidth provides maximum selectivity for the H-alpha line, resulting in high contrast and rich detail in images even against light-polluted skies.

Key features

• bandwidth of 3 nm, concentrated on the H-alpha line (approx. 656 nm)
• bandwidth transmission at approximately 99%
• hard coatings applied using the reactive magnetron sputtering method – high durability and resistance to changing conditions
• additional anti-reflective coatings on the back reduce reflections and ghosting
• Chroma Astronomy filters are parfocal to each other
• optimized for f/4 and slower optics, as well as for operation at f/3 thanks to CWL shift
• not intended for solar observation

Set components

• H-alpha filter 3 nm 36 mm unmounted – CT-27001-36D

Technical parameters

• type: narrowband H-alpha filter for astrophotography
• diameter: 36 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)