Filter Chroma H-alpha 3 nm 1.25 , mounted (SKU: CT-27001-1.25M) all astro filters opinie

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The Chroma H-alpha 3 nm 1.25" Mounted (SKU: CT-27001-1.25M) is a precision narrowband filter for astrophotography of emission nebulae. Made on a single substrate with hard coatings deposited by the reactive magnetron sputtering method, it ensures high H-alpha signal transmission and parameter stability over time.

Key features

• the 3 nm band effectively isolates the H-alpha line (approx. 656 nm) from the sky background and nearby emissions
• high bandwidth transmission – approx. 99%
• hard (sputtering) and anti-reflective coatings on the back minimize reflections and ghosting
• Chroma Astronomy series filters are parfocal to each other, which facilitates work with filter wheels and filter drawers
• designed for f/4 and slower systems; 3nm versions are also optimized for f/3 (CWL shift), and for even faster than f/3, 5nm or wider bandwidths are recommended
• not suitable for observing the Sun

Set components

• 3 nm 1.25" H-alpha filter in the holder – CT-27001-1.25M

Technical parameters

• type: narrowband H-alpha filter for astrophotography
• bandwidth: 3 nm
• 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)
• diameter/frame: 1.25"
• production: USA (Vermont)