Filter Chroma O-III 3 nm 31 mm, unmounted (SKU: CT-27006-31D) all astro filters opinie

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The Chroma O-III 3nm 31mm Unmounted (SKU: CT-27006-31D) is a narrowband filter designed for astrophotography of emission nebulae, designed for use with filter wheels and unmounted systems. With its very narrow 3nm bandwidth, it effectively isolates the O-III oxygen line at 500.7nm, enhancing contrast and bringing out detail in deep-sky objects.

Key features

• bandwidth of 3 nm in the O-III range (approx. 500.7 nm)
• transmission in the band of approximately 99%
• hard coatings applied using the reactive magnetron sputtering method – high durability and resistance to weather conditions
• anti-reflective coatings on the back surface reduce reflections and ghosting
• all Chroma Astronomy filters are parfocal to each other
• optimized for f/4 and slower optical systems, also compatible with f/3 systems
• the filter is not intended for observing the Sun

Set components

• O-III filter 3 nm 31 mm unmounted – CT-27006-31D

Technical parameters

• type: O-III narrowband filter for astrophotography
• diameter: 31 mm, unframed
• bandwidth: 3 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)