Baader Narrowband Filter Set Ultra-H 2 (SKU: 2961684) all astro filters opinie

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Baader Ultra-H 2" Narrowband Filter Set (SKU: 2961684) is a premium set of three unmounted narrowband filters: H-alpha, O-III and S-II, specifically designed for extremely fast optical systems faster than f/2.3. The filters belong to Baader’s CMOS Ultra-High Speed line and are optimized for modern CMOS sensors, while remaining fully compatible with CCD cameras.

Key features

• set of three narrowband filters: H-alpha, O-III and S-II
• Ultra-High Speed f/2 design for very fast optical systems (faster than f/2.3)
• FWHM bandwidths of 3.5 nm (H-alpha) and 4 nm (O-III and S-II), chosen to balance exposure times in HSO imaging
• optimized for the QE and SNR characteristics of modern CMOS cameras; also suitable for CCD cameras
• high contrast and effective suppression of light pollution, designed for use under severe light-polluted skies (Bortle 9/8/7/(6))
• Reflex-Blocker™ technology with hard anti-reflection coatings to minimize reflections from nearby optical surfaces
• plano-optical polishing and sealed coating edges on each individual filter (Life-Coat™)
• fully blackened edges with a black front-side indicator on the telescope side to suppress edge reflections
• identical filter thickness and high degree of parfocality across the entire set

Box contents

• H-alpha f/2 Ultra-High Speed filter
• O-III f/2 Ultra-High Speed filter
• S-II f/2 Ultra-High Speed filter

Technical specifications

• manufacturer: Baader Planetarium
• article number / SKU: 2961684
• EAN: 4047825104144
• filter type: narrowband, Ultra-High Speed f/2
• application: H-alpha / O-III / S-II (CMOS, CCD)
• recommended focal ratio: faster than f/2.3
• FWHM: 3.5 nm (H-alpha), 4 nm (O-III, S-II)
• central wavelength: 656.3 nm (H-alpha), 500.7 nm (O-III), 671.7 nm (S-II)
• filter diameter: 50.4 mm
• filter thickness (unmounted): 3 mm
• mounting: unmounted
• net weight (set): 0.04 kg