Optolong UHC Light Pollution Nebula Filter 1.25" & 2"

The Optolong UHC Filter is a popular choice for astrophotographers and visual observers who want enhanced contrast and detail in emission nebulae without sacrificing star colour. It is designed to suppress common light pollution while allowing nebular emission lines to pass, making it ideal for backyard imaging and observing from urban or suburban skies.
 
This filter works well with a wide range of telescopes, cameras and eyepieces. It improves nebula visibility by reducing sky glow and enhances contrast for targets such as emission nebulae and hydrogen rich regions. The Optolong UHC is suitable for both visual observing and imaging with DSLR, mirrorless or dedicated astro cameras.
 
Technical Features
• Passes key nebula emission lines including
• Hydrogen Beta at 486 nm
• Oxygen III at 495.9 nm and 500.7 nm
• Hydrogen Alpha at 656.3 nm (depending on design)
• Blocks major broadband light pollution including street lighting
• Multi layer anti reflection coatings for improved transmission
• High quality optical glass for minimal distortion
• Available in both 1.25 inch and 2 inch formats to suit your setup
• Works with refractors, reflectors and SCT telescopes
 
Performance and Compatibility
The Optolong UHC Filter enhances contrast for emission nebulae and star forming regions, helping you see faint details that are often washed out by sky glow. It is effective on a variety of telescope focal ratios and supports DSLR, CMOS and one shot colour cameras. The filter is also suitable for eyepiece use during visual observing, giving nebulae a dramatic contrast boost in light polluted skies.