Baader 3.5nm H-alpha / 4nm O-III / 4nm S-II Ultra-Narrowband f/2 Highspeed Filter-Set 65 x 65 mm - CMOS optimized
Product.Nr.:
BP#2961686
Manufacturer: Baader Planetarium
1.665,00 EUR
incl. 19 % VAT
-
Nicht auf Lager
products condition NewCondition
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product description
- Ø 65 x 65 mm x 3 mm
- 3.5 nm FWHM: H-alpha (to harmonize the exposure time from H-alpha with O-III / S-II)
- 4 nm FWHM: 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
- 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 3.5 nm (equivalent to 35 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) : 3.5 nm (H-alpha), 4 nm (O-III, S-II)
- Thickness : 3 mm
- Planeoptically polished (1/4 Lambda)
- AR-Coating : Reflex-Blocker™ hard coated
- Life-Coat™
- Blackened edges
- Filter sizes : 65 x 65 mm, square
- Filter mounted : Unounted
- Baader-filterbox, combinable
Scope of Delivery
- Baader 3.5nm H-alpha / 4nm O-III / 4nm S-II Ultra-Narrowband f/2 Highspeed Filter-Set 65 x 65 mm - CMOS optimized
- Baader-filterbox/Filter, combinable
NB= Narrowband / CWL= Center-wavelength / FWHM= full width at half maximum / AR= Anti Reflection Coating.
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