Optolong UHC Filter 1.25 inch: More contrast on emission nebulae
UHC stands for Ultra High Contrast: this filter primarily allows the emission lines of nebulae (including H-beta, OIII, and H-alpha) to pass through while blocking light pollution from streetlights and skyglow. Emission nebulae like the Orion Nebula or the Ring Nebula visibly gain contrast from this, even when viewed through the eyepiece.
Under a light-polluted sky, a UHC filter is often the difference between a faint suspicion of a nebula and truly seeing it.
Features
- Transmission of the main fog emission lines
- Mercury and sodium lighting and skyglow block
- For visual and photographic use
- Multi-layer coated glass in a thin metal frame
Compatibility
Fits M28.5 x 0.6 thread in eyepieces, diagonal mirrors, and camera nosepieces with 1.25 inch connection.
Specifications
| Type | UHC nebular contrast filter |
| Size | 1.25 inches |
| Thread | M28.5 x 0.6 |
| Observation goals | Emission nebulae, visual and photographic |
You can find more accessories for this brand at the Optolong brand page.
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