Filter Chroma H-alpha 8 nm 65x65 mm, unmounted (SKU: CT-27003-65X65) all astro filters opinie

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The Chroma H-alpha 8 nm 65x65 mm Unmounted (SKU: CT-27003-65X65) is a narrowband filter in a large square format, designed for the most demanding astrophotography applications. Its 8 nm bandwidth provides high light transmission while maintaining H-alpha selectivity, enabling shorter exposure times and highly detailed images.

Key features

• bandwidth of 8 nm in the H-alpha line (approx. 656 nm)
• bandwidth transmission at approximately 99%
• hard coatings applied using the reactive magnetron sputtering method – durable and resistant to environmental conditions
• anti-reflective coatings on the back surface reduce reflections and ghosting
• all Chroma Astronomy filters are parfocal to each other
• designed to work in f/4 and slower optical systems
• the filter is not suitable for observing the Sun

Set components

• H-alpha filter 8 nm 65x65 mm unframed – CT-27003-65X65

Technical parameters

• type: narrowband H-alpha filter for astrophotography
• format: 65x65 mm, unframed
• bandwidth: 8 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)