Celestron 94123-CGL 1.25-inch UHC/LPR Filter Multicoloured

• LIGHT POLLUTION (LPR) FILTERS: Designed to selectively reduce the transmission of certain wavelengths of light.
• ULTRA HIGH CONTRAST (UHC) FILTER: Offers darker sky backgrounds and improved contrast of emission nebulae.
• IMPROVED TRANSMISSION: Advanced technology coatings enable the filter to achieve a transmission of over 97% across the entire bandpass with total blockage of prominent light pollution lines.
• MULTI-LAYER DIELECTRIC COATINGS: Plasma assisted and Ionbeam hardened using the latest technology for durability and resistance to scratching.
• OPTIMUM SPECTRAL AND OPTICAL CHARACTERISTICS: The UHC/LPR Filter 1.25 inch retains natural views, resulting in the highest quality celestial images.

Product Description Celestron's 1.25-inch Light Pollution Reduction (LPR) Filters are designed to selectively reduce the transmission of certain wavelengths of light, specifically those produced by artificial light. This includes mercury vapour, and both high and low pressure sodium vapour lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow). The ultra high contrast (UHC) LPR filter has improved contrast over the typical broadband filters. Sky background is darker, and contrast of emission nebulae are noticeably improved. The coatings enable the filter to achieve a transmission of over 97% across the entire bandpass, with total blockage of prominent light pollution lines. The ideal filter for viewing nebula from light polluted skies, or for boosting the contrast of nebula from dark sky sites. In addition to its optimum spectral and optical characteristics, the UHC/LPR filter offers important features that set it apart and result in the quality celestial views: The multi-layer dielectric coatings are plasma assisted and Ionbeam hardened using technology for durability and resistance to scratching. Improved transmission translates to maximum image brightness and contrast. Users of smaller, 4 to 11-inch telescopes will especially appreciate the efficiency, and larger scope users will love the rich star fields and detailed subtle nebular shadings that are left intact. The high transmission, sharp cutoffs, and more moderate 60 nm passband of the UHC/LPR filter retains a more natural view, yet significantly boosts overall contrast. Imagers will appreciate the broader bandpass and inclusion of an efficient H-Alpha passband (656 nm). Box Contains 1 x UHC/LPR Filter 1.25 inch