Baader S-II Ultra-Narrowband 4nm Ø 50.4 mm filter optimized for CMOS

Baader S-II Ultra-Narrowband 4nm 50.4 mm diameter filter optimized for CMOS

This new generation of Baader CMOS filters features:

• CMOS-optimized Baader filters
• Increased contrast
• Narrower and narrower pass bands
• Reflex-Blocker ™ coatings, for the greatest freedom from halos, even in the most adverse conditions related to auxiliary optics
• FWHM in each filter category carefully designed to allow 1: 1: 1: 1 exposures, combined for typical CMOS quantum efficiency and s/w ratio
• Filter thickness identical to existing standards, with extreme care for parafocality
• Blackened edges all around, with filter lead-side indicator in the form of a black outer edge on the front side, to additionally eliminate any reflections due to light falling on the edge of a filter
• Each filter individually coated, with sealed coating edge (NOT cut from a larger plate with exposed coatings)
• Life-Coat ™: increasingly hard coatings to allow for a coating that will not age for life, even in the harshest environment

General Features:

• 50.4 mm x 3 mm Baader S-II ultra narrow band filter - Superior grade
• 4 nm FWHM, recommended for f/10 to f/3.5 optical systems
• For the highest contrast even with the strongest light pollution, minimizes star size, emphasizes the finest nebula details, indispensable under Bortle 9/8/7 / (6) skies
• Reflex-Blocker ™ hard-coated and planoptically polished, with sealed coating edges (Life-Coat ™)
• Blackened edges all around, with filter lead side indicator in the form of a black outer edge on the front side
• Optimized for modern CMOS cameras, but excellent for CCD camera technologies

Technical Specifications:

• MANUFACTURER Baader Planetarium
• NET WEIGHT (KG) 0.07
• COLOR Black
• TRANSMISSION RANGE S-II
• FILTER THICKNESS (WITHOUT FILTER CELL) 3 mm
• HBW (HALF WIDTH OF BAND) 4 nm
• CWL (CENTER WAVELENGTH LENGTH) 671.7 nm
• AR-COATING Reflex-Blocker ™ hard-coated, planoptically polished
• SPECIAL FEATURES Life-Coat ™ optimized CMOS
• FILTER SIZE 50.4 mm
• CMOS, CCD, S-II FILTER USE
• FILTER ASSEMBLED UNASSEMBLED
• FILTER TYPE f/2 Ultra-Narrowband
• aLONE OR AS A SET? Single filter
• FILTER SHAPE round

50.4 mm Baader S-II Ultra-Narrowband 4nm filter optimized for CMOS