Filter Chroma H-alpha 5 nm 65x65 mm, unmounted (SKU: CT-27002-65X65) all astro filters opinie

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The Chroma H-alpha 5 nm 65x65 mm unmounted (SKU: CT-27002-65X65) is a narrowband filter in a large square format, designed for the most advanced astrophotography systems. With a 5 nm bandwidth, it provides effective cutoff of the sky background while maintaining high H-alpha signal transmission, facilitating the capture of subtle structures in emission nebulae.

Key features

• 5 nm band tuned to the H-alpha line (approx. 656 nm)
• transmission in the band of approximately 99%
• hard coatings applied using the reactive magnetron sputtering method – high mechanical resistance and spectral stability
• additional anti-reflective coatings on the back surface minimize reflections and ghosting
• all Chroma Astronomy filters are parfocal to each other
• designed for optical systems f/4 and faster, also recommended for f/3
• not suitable for observing the Sun

Set components

• H-alpha filter 5 nm 65x65 mm unframed – CT-27002-65X65

Technical parameters

• type: narrowband H-alpha filter for astrophotography
• format: 65x65 mm, unframed
• 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)