Filter Chroma O-III 8 nm 65x65 mm, unmounted (SKU: CT-27008-65X65) all astro filters opinie

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The Chroma O-III 8 nm 65x65 mm Unmounted (SKU: CT-27008-65X65) is a large square format narrowband filter designed for the most demanding astrophotography systems. With an 8 nm bandwidth, it effectively isolates the O-III oxygen line at 500.7 nm, providing high contrast and high light transmission, allowing for shorter exposure times and capturing fainter structures in nebulae.

Key features

• 8 nm bandwidth concentrated on the O-III line (approx. 500.7 nm)
• bandwidth transmission at approximately 99%
• hard coatings applied using the reactive magnetron sputtering method – very high durability and resistance to environmental conditions
• anti-reflective coatings on the back surface eliminate reflections and ghosting
• all Chroma Astronomy filters are parfocal to each other
• designed for optical systems f/4 and slower
• the filter is not suitable for observing the Sun

Set components

• O-III filter 8 nm 65x65 mm unframed – CT-27008-65X65

Technical parameters

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