Filter Chroma H-alpha 8 nm 36 mm, unmounted (SKU: CT-27003-36D) all astro filters opinie

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The Chroma H-alpha 8nm 36mm Unmounted (SKU: CT-27003-36D) is a narrowband filter for astrophotography of emission nebulae, designed for use in filter wheels and unmounted systems. The 8nm band provides high light transmission, which shortens exposure times and facilitates photographing objects even with faster optics.

Key features

• 8 nm bandwidth tuned to 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
• anti-reflective coatings on the back surface eliminate reflections and ghosting
• all Chroma Astronomy filters are parfocal to each other
• dedicated to optical systems with a f/4 aperture and slower
• not suitable for observing the Sun

Set components

• H-alpha filter 8 nm 36 mm unmounted – CT-27003-36D

Technical parameters

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