- 2" Eyepiece Filter; with metal mount 2" filter threads
- For Horsehead Nebula California; and Cocoon Nebulae in Dark Skies
- Mainly aimed at the 486nm (blue) line spectrum nebula; filters out the interference of other light; can improve the contrast of the nebula
- Through the use of filters; the Horsehead Nebula can be clearly seen; filter with metal mount 2" filter threads; threaded to fit 2" eyepieces and threaded diagonal barrels
- To see a sufficiently dark nebula; ensure a large enough luminous flux; needs to be observed with a large-aperture telescope
In Stock
| Model | SV132 |
| Type | H-Beta |
| Size | 2-Inch |
| Substrate | B270 |
| Substrate Thickness | 1.85mm |
| Wavelength Range | 400-700nm |
| CWL | 486nm±2nm |
| FWHM | 25nm±2nm |
| T peak | 90% |
| Blocking | OD3 @300-1100nm |
| Clear Aperture | 44mm |
| Surface Quality | 60/40 |
| Surface parallelism | 1/4λ |
| Parallelism | 30" |
| Net Weight | 13.2g / 0.47oz |
The H-Beta filter is a narrowband filter specially designed for visual observation. It is mainly aimed at the 486nm (blue) line spectrum nebula, removes the interference of other light, and improves the contrast. During observation, in order to see sufficient dark nebula, it is necessary to ensure a large enough luminous flux with a large-aperture telescope. Small-aperture telescopes are not recommended. It is suitable for observing the Horsehead Nebula in Orion and the California Nebula. Filter with metal 2" threads fits 2" eyepieces and diagonal barrels.