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- Baader Ultra-Narrowband 3.5nm H-Alpha CCD-Filter
- Deep sky imaging use
- For fast optical systems from f / 10 to f / 3.5
- non-ageing sealed coating edges
Description
This premium grade ultra narrowband 3.5nm Baader H-Alpha (Ha) filter is for use with fast optical systems with focal ratios between f/3.5 to f/10. The filter also has non-ageing sealed coated edges for long life.
Specifications
| TRANSMISSION RANGE | H-Alpha |
|---|---|
| FILTER THICKNESS (WITHOUT CELL) | 2 mm / 3 mm |
| HBW (HALFBANDWIDTH) | 3.5nm |
| CWL (CENTRAL WAVELENGTH) | 656.3 nm |
| AR-COATING | dielectrically coated, plane-optically polished |
| FILTER USAGE | CCD, Hα |
| TYPE OF FILTER | Narrowband |
| SINGLE OR SET? | Single Filter |