Product details:

The UHC/LPR filter has improved contrast over the typical broadband filters that gives darker background skies and remarkably improved contrast of emission nebulae. The astronomy filter features advanced technology coatings that enable the filter to achieve an outstanding transmission of over 97% across the entire bandpass, with total blockage of prominent light pollution lines. The multi-layer dielectric coatings are plasma assisted and Ionbeam hardened that yields supreme durability. The improved transmission translates to maximum image brightness and contrast. UHC/LPR Filter Features: Product # 94123 1.25" UHC/LPR Filter Improved Contrast Over 97% Transmission Multi-Layer Dielectric Coatings - Plasma Assisted - Ionbeam Hardened Eliminates Unwanted Bandwidths of Light Sharp Cutoffs 60nm Passband