Filter Chroma O-III 3 nm 1.25 , mounted (SKU: CT-27006-1.25M) all astro filters opinie

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The Chroma O-III 3 nm 1.25" Mounted (SKU: CT-27006-1.25M) is a narrowband filter designed for astrophotography of emission objects such as planetary nebulae and supernova remnants. Its 3 nm bandwidth provides precise isolation of the oxygen O-III line at 500.7 nm, significantly increasing contrast and detail visibility.

Key features

• bandwidth of 3 nm in the O-III line range (approx. 500.7 nm)
• bandwidth transmission at approximately 99%
• hard coatings applied by reactive magnetron sputtering – durability and spectral stability
• anti-reflective coatings on the back surface reduce reflections and ghosting
• all Chroma Astronomy filters are parfocal to each other
• optimized for use in f/4 and slower optical systems, the 3nm version also works at f/3
• the filter is not intended for observing the Sun

Set components

• O-III 3 nm 1.25" filter in the holder – CT-27006-1.25M

Technical parameters

• type: O-III narrowband filter for astrophotography
• diameter/frame: 1.25"
• 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)