Orion 5559 1.25-Inch SkyGlow Astrophotography Filter Specialized astrophotography filter designed for deep-sky imaging in light polluted skies with CCD or DSLR cameras The SkyGlow Imaging filter suppresses up to 99% transmission of specific light wavelengths responsible for light pollution Enhances contrast of all types of deep-sky objects: galaxies, nebulas, and star clusters Filter with metal filter cell construction preserves neutral color balance, eliminating need for corrective color processing later Enables longer astrophotographic exposure times without background saturation due to sky glow