Set of 3 Baader Ultra-Highspeed 3.5 / 4nm f/3 1¼" CMOS optimized filters (H-alpha / O-III / S-II)
This new generation of Baader CMOS filters is characterized by
- CMOS-optimized Baader filters
- Increased contrast
- Increasingly narrower pass bands
- Reflex-Blocker™ coatings, for increased freedom from halos, even under the most adverse conditions related to auxiliary optics
- FWHM in each filter category carefully designed to allow 1:1:1 exposures, matched to typical CMOS quantum efficiency and s/w ratio
- Filter thickness identical to existing standards, with the utmost care for parfocality
- Blackened edges all around, with a filter side indicator in the form of a black outer edge on the front, to additionally eliminate any reflections due to light falling on the edge of a filter
- Each filter individually coated, with the coating edge sealed (NOT cut out of a larger plate with coatings left exposed, read more)
- Life-Coat™: increasingly tougher coatings to enable a coating that will not age for life, even in the harshest environment
General features:
- 1¼" x 2 mm Baader CMOS H-alpha / O-III / S-II f/3 High Speed Filter Set - Premium Grade - with 1¼" (28.5 mm) filter thread
- 3.5 / 4 nm FWHM (to harmonize the exposure time of H-alpha with O-III / S-II), recommended for fast f/3.4 to f/2.3 optical systems
- Specially designed for the special requirements of filters when used with fast f/3 optics
- For maximum contrast even with the highest light pollution, minimizes the size of stars, emphasizes the finest details of nebulae - 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-side indicator in the form of a black outer edge on the telescope side
- Optimized for modern CMOS cameras, but equally excellent for CCD camera technologies
- Mounted on Baader's low profile filter cell (LPFC) - 6 mm high
Technical specifications:
- MANUFACTURER Baader Planetarium
- SKU (#) 2961640
- EAN CODE 4047825051813
- NET WEIGHT (KG) 0.18
- SUITABLE FOR RATIO F/3.4 to f/2.3
- TRANSMISSION RANGE H-alpha / O-III / S-II
- FILTER THICKNESS (WITHOUT FILTER CELL) 2 mm
- HBW (HALFBANDWIDTH) 3.5 nm (H-alpha) / 4 nm (O-III / S-II)
- CWL (CENTRAL WAVE LENGTH) 656.3 nm / 500.7 nm / 671.7 nm
- AR COATING Reflex-Blocker™ hard-coated, flat-optically polished AR COATING
- SPECIAL FEATURES CMOS-optimized with Life-Coat™
- FILTER SIZE 1 25 in
- CMOS, CCD, H-alpha, O-III, S-II FILTER APPLICATIONS
- FILTER MOUNTING Mounted (LPFC 6mm)
- FILTER TYPE f/3 Ultra-Highspeed
- oNE OR SET? Filter-Set
- FILTER SHAPE round
Set of 3 Baader Ultra-Highspeed 3.5 / 4nm f/3 filters at 1¼" optimized for CMOS (H-alpha / O-III / S-II)
