Astronomik UHC SC Rear Cell (2" / 24TPI)
Key specifications
| Filter type | Light Pollution |
|---|---|
| Passband | 480-505nm + above 645nm |
| Bandwidth | 25 nm |
| Filter size | Other |
| Mounted | Yes |
About
An Ultra High Contrast filter passing the OIII and H-beta lines at near 100% while blocking sodium and mercury street lighting and natural airglow, lifting gaseous and planetary nebulae out of the sky background. Usable from f/3 to f/15. This is the version that threads onto a Schmidt-Cassegrain rear cell.