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491 EUR
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price without VAT: 399 EUR
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Astronomik H-alpha 6nm CCD T-Mount (M42 × 0.75) Filter (SKU: 10212542 / 8h00ch) is a narrowband emission filter designed for imaging hydrogen nebulae. It records light emitted at the H-alpha 656 nm line and significantly increases contrast between the object and the sky background. The T-Mount design allows integration into astrophotography systems using the M42 × 0.75 thread standard.
With its 6 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. When imaging faint objects in dense Milky Way star fields, the 6 nm version helps reduce the number of recorded stars and reveals faint nebular structures more clearly.
The 6 nm version is particularly recommended for imaging from extremely light-polluted locations and when using cameras with very low dark current. This filter must not be used for solar observation.
• narrowband H-alpha filter for imaging hydrogen nebulae
• transmission band centered on the H-alpha 656 nm line
• 6 nm bandwidth
• T-Mount interface with M42 × 0.75 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
• especially useful under strong light pollution and during full Moon imaging
• helps reveal faint nebular structures in dense Milky Way star fields
• Astronomik MFR coating ensures high contrast and minimal stray light
• Astronomik H-alpha 6nm CCD T-Mount (M42 × 0.75) filter
• durable filter storage box
• type: H-alpha narrowband filter
• mount standard: T-Mount
• thread: M42 × 0.75
• central wavelength: 656 nm
• bandwidth: 6 nm
• guaranteed transmission at the H-alpha line: over 90%
• typical transmission at the H-alpha line: 93%
• glass thickness: 1 mm
• material: finely polished optical glass free of streaks, internal stress and bubbles
• coating: Astronomik MFR
• recommended focal ratio range: f/4–f/∞
• coating durability: highly resistant to scratches, humidity and aging
• optical characteristics: parfocal, diffraction-limited
This filter enables astrophotographers to capture hydrogen nebula structures with excellent contrast and fine detail even in demanding observing conditions.
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