Filtre SII Ultra-Narrowband 50x50mm pour l'Astrophotographie - Série Ultra-Narrowband Baader

The Baader SII Ultra-Narrowband 50x50mm filter is designed to capture the specific light emitted by ionized sulfur atoms at a wavelength of 672 nm. With its ultra-narrow 4 nm bandwidth, it effectively isolates this spectral line, making it an essential tool for astrophotographers wanting to image emission nebulae, planetary nebulae, and supernova remnants, even in light-polluted environments.FeaturesAdvantagesCompatibilityItems IncludedType: Narrowband filterSeries: Ultra-NarrowbandCentral wavelength: 671.7 nmBandwidth: 4 nmDimensions: 50 x 50 mmThickness: 2 mmAnti-reflection Reflex-Blocker™ coatingMount: aluminum frameIntended use: astrophotography onlyCompatible aperture range: f/10 to f/3.5Optimized for CMOS sensorsExcellent isolation of the SII line at 672 nmSignificantly improves contrast on emission nebulaeIdeal for imaging in urban areas or under light-polluted skiesCompatible with all unmounted 50x50 mm filter holdersDesigned for instruments from f/3.5 to f/10SII 50 x 50 mm Ultra-Narrowband filterDust-proof protective packaging