Astronomik OIII 12nm CCD 1,25 (M28,5) (SKU: 10215125 / 8h00c9) all astro filters opinie

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Astronomik OIII 12nm CCD 1.25" (M28.5) Filter (SKU: 10215125 / 8h00c9) is a narrowband emission filter designed for imaging nebulae that emit light in the oxygen [OIII] lines. It records light at wavelengths of 496 nm and 501 nm, significantly increasing contrast between the object and the sky background. The 1.25" filter format with M28.5 filter thread allows use in a wide range of compatible astronomical accessories.

With its 12 nm bandwidth, the filter effectively blocks unwanted light at other wavelengths from ultraviolet to infrared. It suppresses emission lines from sodium and mercury vapor lamps, natural airglow and a large portion of moonlight, enabling high-contrast imaging both under dark skies and in heavily light-polluted environments.

The OIII filter allows imaging of planetary nebulae, star-forming regions and supernova remnants. Combined with H-alpha and SII filters it enables the creation of emission-line images using the HSO palette.

Key features

• narrowband OIII filter for imaging emission nebulae
• transmission band covering the [OIII] lines at 496 nm and 501 nm
• 12 nm bandwidth
• 1.25" filter format
• M28.5 filter thread
• significantly increases contrast between the object and the sky background
• blocks sodium and mercury emission lines, natural airglow and a large portion of moonlight
• suppresses unwanted light from UV to IR
• Astronomik MFR coating ensures high contrast and minimal stray light

Included items

• Astronomik OIII 12nm CCD 1.25" (M28.5) filter
• durable filter storage box

Technical specifications

• type: OIII narrowband filter
• standard: 1.25"
• filter thread: M28.5
• transmission lines: 496 nm and 501 nm
• bandwidth: 12 nm
• guaranteed transmission at the OIII line (501 nm): over 90%
• typical transmission at the OIII line: 95%
• glass thickness: 1 mm
• material: finely polished optical glass free of streaks, internal stress and bubbles
• coating: Astronomik MFR
• recommended focal ratio range: f/3–f/∞
• coating durability: highly resistant to scratches, humidity and aging
• optical characteristics: parfocal, diffraction-limited

This filter allows astrophotographers to capture oxygen-emission nebula structures with excellent contrast even under demanding observing conditions.