Baader H-alpha / O-III / S-II 6.5nm Narrowband f/2 Highspeed Filter - CMOS optimized
Product.Nr.:
Master-BP-NB-f2
Manufacturer: Baader Planetarium
products condition NewCondition
Seen cheaper?product description
- Filter & Filter-Sets (Ø : 1¼", 2", 31 mm, 36 mm, 50.4 mm, 50 x 50 mm & 65 x 65 mm)
- 6.5 nm FWHM
- 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
- Reflex-Blocker™ hard coated
- Planeoptically polished
- Life-Coat™ : sealed coating edges
- Blackened edges all around, with filter-lead-side-indicator in the form of a black frontside outer rim
- Optimized for modern CMOS cameras (no DSLRs, but "Astro"-CMOS-Cameras (ALccd/QHY etc.))
- Excellent for CCD camera technologies
- Precision Grade
We explicitly warn against observing the sun with a Deep-Sky 6.5 nm (equivalent to 65 Ångström) H-alpha narrowband filter.
High quality H-alpha solar filters start at 0.8 Ångström. Photographic experiments with a camera are theoretically possible, but by no means observe the sun with naked eyes – you endanger your eyesight!
High quality H-alpha solar filters start at 0.8 Ångström. Photographic experiments with a camera are theoretically possible, but by no means observe the sun with naked eyes – you endanger your eyesight!
The new generation of Baader CMOS-optimized filters is characterized by the following properties
- Increased contrast
- Ever more narrow passbands
- Reflex-Blocker™ coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics (Reducer, Flattener, etc.)
- 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 read more)
- Life-Coat™: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment
Technical Data
- Transmission Range : H-alpha
CWL (Central Wavelength) : 656.3 nm - Transmission Range : O-III
CWL (Central Wavelength) : 500.7 nm - Transmission Range : S-II
CWL (Central Wavelength) : 671.7 nm - HBW (Halfbandwidth) : 6.5 nm
- Thickness : 2 mm, from 50.4 mm : 3 mm
- Planeoptically polished (1/4 Lambda)
- AR-Coating : Reflex-Blocker™ hard coated
- Life-Coat™
- Blackened edges
- Filter sizes : 1¼" (Thread, M28.5 mm), 2" (M48), 31 mm, 36 mm, 50.4 mm, 50 x 50 mm, 65 x 65 mm
- Filter mounted : 1.25", 2": Mounted LPFC (= Low Profile Filter Cell (6 mm)), Unmounted
- Baader-filterbox, combinable
NB= Narrowband / CWL= Center-wavelength / FWHM= full width at half maximum / AR= Anti Reflection Coating.
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