Set of 3 Ultra Highspeed filters Ø 1¼" 3,5/4 nm Cmos Optimized Baader Planetarium

Set of 3 Baader H-alpha / O-III / S-II f/2 ultrafast speed filters Ø 1¼" x 2 mm - Top grade - with Ø 1¼" (M28.5) filter thread. 3.5/4 nm FWHM (to harmonize H-alpha exposure time with O-III / S-II), recommended for extremely fast optical systems from f/3.4 to f/1.8. Specially designed for special filter requirements when used with fast optics such as astrographs Celestron RASA or similar. 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. Hard-coated, planoptically polished Reflex-Blocker™ with sealed coating edges ( Life-Coat™). Optimized for modern CMOS cameras, but excellent for CCD camera technologies. Mounted on Baader low profile filter cell (LPFC) - 6 mm high. 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 exposures, combined for typical CMOS quantum efficiency and s/r ratio. Filter thickness identical to existing standards, with extreme care for parafocality. Blackened edges all around, 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 enable a coating that will not age for life, even in the harshest environment.

MANUFACTURER Baader Planetary
SKU (#) 2961680
EAN CODE 4047825104106
NET WEIGHT (KG) 0.18
COLOR Black
TRANSMISSION RANGE H-alpha / O-III / S-II
FILTER THICKNESS (WITHOUT CELL) 2 mm
HBW (HALF BANDWIDTH) 3,5 nm (H-alpha) / 4 nm (O-III / S-II)
CWL (CENTER WAVE LENGTH) 656.3 nm / 500.7 nm / 671.7 nm
AR-COATING Reflex-Blocker™ hard-coated, planoptically polished
SPECIAL FEATURES CMOS optimized with Life-Coat ™
FILTER SIZE 1 25 inch
FILTER USAGE CMOS, CCD, H-alpha, O-III, S-II
FILTER-MOUNTED Mounted (LPFC 6 mm)
FILTER TYPE f / 2 Ultra-Highspeed
SINGLE OR SET? FILTER SET
FILTER SHAPE round