Filter Chroma O-III 5 nm 31 mm, unmounted (SKU: CT-27007-31D) all astro filters opinie

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The Chroma O-III 5 nm 31 mm Unmounted (SKU: CT-27007-31D) is a narrowband filter for astrophotography of emission nebulae, designed for use with filter wheels and mountless systems. The 5 nm bandwidth allows for effective isolation of the O-III oxygen line at 500.7 nm, offering high image contrast while maintaining high light transmission.

Key features

• 5 nm bandwidth concentrated on the O-III line (approx. 500.7 nm)
• transmission in the band of approximately 99%
• hard coatings applied using the reactive magnetron sputtering method – durability and resistance to external factors
• 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
• the filter is not suitable for observing the Sun

Set components

• O-III filter 5 nm 31 mm unmounted – CT-27007-31D

Technical parameters

• type: O-III narrowband filter for astrophotography
• diameter: 31 mm, unframed
• bandwidth: 5 nm
• central wavelength (CWL): approx. 500.7 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)