Product details
The Baader H-alpha 1¼” (28.5 mm) filter with a 20nm FWHM is optimized for deep-sky visual observation and H-alpha astrophotography with modern CCD and CMOS cameras. It provides enhanced contrast of H-II emission regions even under light-polluted skies.
Warning: Not suitable for direct solar observation.
Key Features:
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CWL: 656.3 nm – FWHM: 20 nm
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Advanced UV/IR block coating from 300 to 1400 nm
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Reflex-Blocker™ hard coatings for minimal reflections
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Life-Coat™ sealed coatings: scratch-resistant and weather-proof
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Standard 2 mm thickness, fully compatible with filter wheels
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Works with all focal ratios, no need for pre-shifting
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Ideal for color cameras to enrich red channel or substitute R-filter in RGB imaging
Compared to the older 35nm H-alpha filters, this 20nm version aligns with today’s camera sensitivities and enables brighter stars for easier focusing.
Recommended Use:
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H-alpha deep-sky imaging
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Enhancing RGB red channel
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Suitable for CMOS and CCD color sensors
