2" Baader 3.5 / 4nm f/2 Ultra High Speed Filter Set – Optimized CMOS (H-alpha / O-III / S-II)
Baader CMOS H-alpha / O-III / S-II f/2 2" x 2mm Ultra High Speed Filter Set - premium grade - with 2" screw thread (M48)
3.5/4nm FWHM (to harmonize the exposure time of H-alpha with O-III/S-II), recommended for extremely fast optical systems greater than f/2.3
Specially designed for special filter requirements when used with extremely high aperture f/2 optics such as Celestron's RASA astrographs.
Enables the highest contrast even in the strongest light pollution, minimizes star size, makes the finest detail of the nebula accessible - indispensable under Bortle skies 9/8/7/(6)
Plano-optically polished, hard-coated Reflex-Blocker™ with sealed coating edges (Life-Coat™)
Blackened edges all around, with front filter indicator in the form of a black outer rim on the side of the telescope
Optimized for modern CMOS cameras, equally suitable for CCD camera technologies
Encased in a Baader Low Profile Filter Cell (LPFC): 6mm high
The new generation of Baader filters optimized for CMOS is characterized by:
Baader filters optimized for CMOS
higher contrast
full widths even narrower at half maximum (FWHM)
Reflex-Blocker™ coatings for the highest possible insensitivity to retroreflection from the nearest auxiliary optics, even in the harshest conditions
Carefully designed FWHM for each filter category to allow 1:1:1 exposures tuned to typical CMOS quantum efficiency and signal-to-noise ratio
Filter thickness identical to existing standards, with the greatest care regarding homofocality
Blackened edges all around, with front filter indicator in the form of a black outer edge at the front to further prevent any reflection of light falling on the edge of the filter.
Each filter is individually polished and optically fine coated, with a sealed coating edge (NOT cut from a larger plate, with the result that the coating edges are exposed, see more on this here)
Life-Coat™ – even harder coatings to allow an aging resistant coating for unlimited life, even in the harshest environments
Especificaciones:
| MANUFACTURER | Baader Planetarium |
|---|---|
| SKU (#) | 2961683 |
| EAN CODE | 4047825104137 |
| NET WEIGHT (KG) | 0.20 |
| SUITABLE FOR F/RATIO | < f/2.3 |
| TRANSMISSION RANGE | H-alpha / O-III / S-II |
| FILTER THICKNESS (WITHOUT CELL) | 2 mm |
| HBW (HALFBANDWIDTH) | 3.5 nm (H-alpha) / 4 nm (O-III / S-II) |
| CWL (CENTRAL WAVELENGTH) | 656,3 nm / 500,7 nm / 671,7 nm |
| AR-COATING | Reflex-Blocker™ hard coated, planeoptically polished |
| SPECIAL FEATURES | CMOS-optimized with Life-Coat™ |
| FILTER SIZE | 2 inch |
| FILTER USAGE | CMOS, CCD, H-alpha, O-III, S-II |
| FILTER MOUNTED | Mounted (LPFC 6mm) |
| TYPE OF FILTER | f/2 Ultra-Highspeed |
| SINGLE OR SET? | Filter-Set |
| FILTER SHAPE | round |
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