Optolong UHC Filter 1.25 inches

Optolong Filters UHC Filter 1.25″ is a widely applicable light pollution filter designed specifically for deep-sky observation and astrophotography. The filter (UHC = Ultra High Contrast) blocks interfering emissions from artificial light, such as from sodium and mercury lamps, while allowing the main emission lines of deep-sky objects - H-beta, OIII and partial H-alpha - to pass through well.

The result is greatly enhanced contrast and a darker sky background, making nebulae, star clusters and galaxy structures clearly more visible. Under moderate to strong light pollution, you can observe much more detail with this filter than without it. Well-known objects such as the Orion Nebula, the Veil Nebula or the Lagoon Nebula show more structure and brightness, even with medium-sized telescopes.

Thanks to its 1.25″ mount, this filter is compatible with virtually all standard eyepieces and accessories. The high-quality optical glass with multiple anti-reflection coating ensures true-to-life color reproduction and minimal reflections.

Observation goals
This filter is ideal for visual observers who want to enhance their deep-sky experiences in light-polluted areas. Also suitable for first experiments in astrophotography with DSLRs and color cameras. For observing planets or galaxies, the effect is limited, as the filter mainly makes emission nebulae and gas clouds more visible.

Specifications

• Type: UHC (Ultra High Contrast) filter
• Diameter: 1.25″ mount
• Material: Optical glass with multiple anti-reflection coating
• Mount: Aluminum
• Application:
  • ✓ Improvement of contrast in deep-sky objects
  • ✓ Orion Nebula, Veil Nebula, Lagoon Nebula
  • ✓ Astrophotography in light-polluted areas
  • ✗ Limited effect in planets and galaxies