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
