Omegon Pro UHC Nebula Filter 1.25 inch: narrowband contrast on emission nebulae
UHC stands for Ultra High Contrast. This narrowband filter primarily allows the OIII and H-beta lines to pass through while virtually completely suppressing disruptive city light. As a result, the sky background becomes deeply dark, while emission nebulae light up.
The difference is most apparent on objects like the Veil Nebula and the Lagoon Nebula, where filaments and edges become visible that are barely noticeable without a filter. Even under a dark sky, the filter provides extra contrast.
Features
- Narrowband pass around the OIII and H-beta lines
- Sodium and mercury lighting suppress virtually entirely
- Multiple coating reduces reflections
- Standard 1.25 inch thread
Compatibility
Fits any 1.25 inch eyepiece. The filter costs light, so expect a telescope with about a 100 mm aperture for the best result.
Specifications
| Type | UHC small band filter |
| Mount | 1.25 inches |
| Admitted lines | OIII in H-beta |
| Observation goals | Visuals, emission nebulae |
| Recommended opening | From about 100 mm |
You can find more accessories for this brand at the Omegon brand page.
Richard Rosendal (verified owner) -
Works perfectly when looking at fog etc., these become noticeably more visible.