36mm (4nm) S-II Ultra Narrow Band Filter - Optimized for CMOS
36mm x 2mm Ultra Narrowband (Narrowband) CMOS S-II Baader Filter - Premium Grade
4nm FWHM, recommended for optical systems slower than f/3.4
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
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 (#) | 2961477 |
| EAN CODE | 4047825047984 |
| NET WEIGHT (KG) | 0.06 |
| SUITABLE FOR F/RATIO | > f/3.4 |
| TRANSMISSION RANGE | S-II |
| FILTER THICKNESS (WITHOUT CELL) | 2 mm |
| HBW (HALFBANDWIDTH) | 4 nm |
| CWL (CENTRAL WAVELENGTH) | 671,7 nm |
| AR-COATING | Reflex-Blocker™ hard coated, planeoptically polished |
| SPECIAL FEATURES | CMOS-optimized with Life-Coat™ |
| FILTER SIZE | 36 mm |
| FILTER USAGE | CMOS, CCD, S-II |
| FILTER MOUNTED | Unmounted |
| TYPE OF FILTER | Ultra-Narrowband |
| SINGLE OR SET? | Single Filter |
| FILTER SHAPE | round |
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