Baader S-II Ultra-Narrowband 4nm Ø 1¼" filter optimized for CMOS

Baader S-II Ultra-Narrowband 4nm 1¼" 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:

• 1¼" x 2 mm Baader S-II ultra narrow band filter - Superior grade - with 1¼" (28.5 mm) filter thread
• 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
• Mounted on Baader Low Profile Filter Cell (LPFC) - 6 mm high

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 BAND WIDTH) 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 1.25 in
• CMOS, CCD, S-II FILTER USAGE
• MOUNTED FILTER Mounted (LPFC 6 mm)
• FILTER TYPE f/2 Ultra-Narrowband
• sINGLE OR SET? Single filter
• FILTER SHAPE round

1¼" Ultra-Narrowband 4nm Baader S-II filter optimized for CMOS