Filter Chroma O-III 5 nm 50 mm, unmounted (SKU: CT-27007-50D) all astro filters opinie

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The Chroma O-III 5 nm 50 mm Unmounted (SKU: CT-27007-50D) is a large-format narrowband filter designed for astrophotography of emission nebulae. With a 5 nm bandwidth, it effectively isolates the O-III oxygen line at 500.7 nm, offering high contrast and high light transmission, making it suitable for use with faster optical systems.

Key features

• bandwidth of 5 nm in the O-III range (approx. 500.7 nm)
• bandwidth transmission at approximately 99%
• hard coatings applied using the reactive magnetron sputtering method – exceptional durability and optical stability
• anti-reflective coatings on the back surface minimize reflections and ghosting
• all Chroma Astronomy filters are parfocal to each other
• dedicated to optical systems f/4 and faster, also works well at f/3
• not suitable for observing the Sun

Set components

• O-III filter 5 nm 50 mm unmounted – CT-27007-50D

Technical parameters

• type: O-III narrowband filter for astrophotography
• diameter: 50 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)