Baader S-II Ultra-Highspeed 4nm Ø 31 mm filter optimized for CMOS

31 mm diameter Baader S-II Ultra-Highspeed 4nm Ultra-Highspeed 4nm 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:

• 31 mm x 2 mm Baader S-II ultrafast speed filter - Superior grade
• 4 nm FWHM, recommended for f/3.4 to f/1.8 optical systems
• Specially designed for special filter requirements when used with fast optics such as the Celestron RASA astrographs
• For the highest contrast even with the strongest light pollution, minimizes star size, emphasizes the finest details of the nebula, 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) 0.06
• COLOR Black
• TRANSMISSION RANGE S-II
• FILTER THICKNESS (WITHOUT FILTER CELL) 2 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 CMOS optimized with Life-Coat™ CMOS
• FILTER SIZE 31 mm
• CMOS, CCD, S-II FILTER USAGE
• FILTER ASSEMBLED UNASSEMBLED
• FILTER TYPE f/2 Ultra-Highspeed
• aLONE OR AS A SET? Single filter
• FILTER SHAPE round

31 mm Baader S-II Ultra-Highspeed 4nm Ultra-Highspeed filter optimized for CMOS