Antlia H-Alpha Filter 3.5nm 36mm – Ultra Narrowband Astrophotography
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Vai al moduloAntlia H-Alpha Filter 3.5nm 36mm – Ultra Narrowband for Astrophotography
The Antlia H-Alpha 3.5nm 36mm is a 3.5nm ultra narrowband filter on H-Alpha at 656.3nm. Transmission >88% and OD3 blocking from 300–1100nm. Schott monolithic substrate, parafocal ±0.05mm, hand-blackened edges. Compatible with telescopes up to f/2.0. H-Alpha component of the SHO set for emission nebulae, supernova remnants and RGB enhancement.
Technical Specifications
| Filter type | Ultra narrowband H-Alpha |
| Central wavelength | 656.3nm |
| Bandwidth (FWHM) | 3.5nm |
| H-Alpha transmission | >88% |
| Off-band blocking | OD3 (0.1%) @ 300–1100nm |
| Format | 36mm (unmounted) |
| Substrate | Schott, 2mm ±0.05mm |
| Surface quality | 60/40 (MIL-O-13830) |
| Flatness | 1/4λ |
| Parallelism | 30" |
| Focal ratio | Up to f/2.0 |
| Recommended cameras | CCD/CMOS mono, SHO, emission nebulae |