Description: Baader H-alpha 31mm F2 Ultra Highspeed-Filter 3.5nm CMOS Optimized
Baader H-alpha f/2 Ultra-Highspeed Filter – Premium Grade. 3.5nm FWHM (to harmonize the exposure time from H-alpha with O-III / S-II), recommended for extremely fast optical systems from f/3.4 to f/1.8. Specially designed for the special filter requirements when used with fast optics like the Celestron RASA astrographs.
For highest contrast even at strongest light pollution, minimizes star size, emphasizes finest nebula detail – indispensable under Bortle 9/8/7/(6) skies. Reflex-Blocker™ hard coated and planeoptically polished – with sealed coating edges (Life-Coat™). Blackened edges all around, with filter-lead-side-indicator in the form of a black frontside outer rim. Optimised for modern CMOS cameras, but likewise excellent for CCD camera technologies.
Features: Baader H-alpha 31mm F2 Ultra Highspeed-Filter 3.5nm CMOS Optimized
- Increased contrast
- Ever more narrow passbands
- Reflex-Blocker™ coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics
- FWHM on each filter category carefully designed to allow for 1:1:1 exposures, matched for typical CMOS quantum efficiency and s/n ratio
- Identical filter thickness to existing standards, with utmost care for parfocality
- Blackened edges all around, with filter-lead-side-indicator in the form of a black frontside outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filter
- Each filter coated individually, with sealed coating edge (NOT cut out of a larger plate with coatings left exposed)
- Life-Coat™: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment
Specifications:
- NET WEIGHT (KG) 0.06-0.09
- COLOUR Black
- TRANSMISSION RANGE H-alpha
- FILTER THICKNESS (WITHOUT CELL) 2 mm (3mm D50.4 – 65x65mm)
- HBW (HALFBANDWIDTH) 3.5 nm
- CWL (CENTRAL WAVELENGTH) 656,3 nm
- AR-COATING Reflex-Blocker™ hard coated, planeoptically polished
- SPECIAL FEATURES CMOS-optimized with Life-Coat™
- FILTER SIZE 1 25 inch – 65x65mm
- FILTER USAGE CMOS, CCD, H-alpha
- FILTER MOUNTED Mounted (LPFC 6mm)
- TYPE OF FILTER f/2 Ultra-Highspeed
- SINGLE OR SET? Single Filter
- FILTER SHAPE round/square
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