Celestron UHC/LPR 1.25' Optical Filter

Technical Details: Celestron UHC/LPR Filter - 1.25"

Our 1-1/4" Light Pollution Reduction (LPR) Filters are engineered to selectively diminish the transmission of specific light wavelengths, particularly those emitted by artificial sources.

These encompass mercury vapour, alongside high and low-pressure sodium vapour lights, and the undesirable natural light generated by neutral oxygen emission in our atmosphere, commonly known as sky glow. The ultra high contrast (UHC) LPR filter enhances contrast beyond the standard broadband filters.

The sky background appears darker, and the contrast of emission nebulae is markedly improved. Thanks to advanced coating technology, the filter achieves an exceptional transmission rate of over 97% across the entire bandpass, completely blocking prominent light pollution lines.

Key Features

• Ultra High Contrast (UHC) LPR filter
• Advanced coating technology
• Exceptional transmission rate of over 97%
• Multi-layer dielectric coatings
• High transmission, sharp cut-offs, and moderate 60nm passband

This makes it the ideal filter for observing nebulae in light polluted skies or for enhancing the contrast of nebulae in dark sky locations.

Beyond its optimal spectral and optical characteristics, the UHC/LPR filter possesses key features that distinguish it and result in superior celestial views: The multi-layer dielectric coatings are plasma-assisted and ion-beam hardened using cutting-edge technology for durability and scratch resistance. Enhanced transmission equates to maximum image brightness and contrast.

Users of smaller, 4"-11" telescopes will particularly value the high efficiency, while larger scope users will be captivated by the rich star fields and intricate subtle nebular shadings that remain intact.

The high transmission, sharp cut-offs, and more moderate 60nm passband of the UHC/LPR filter retain a more natural view, yet significantly amplify overall contrast. Imagers will value the broader bandpass and inclusion of an exceptionally efficient H-Alpha passband (656nm).