Orion 5561 2-Inch SkyGlow Astrophotography Filter
Use this specially designed 2" astrophotography filter for deep-sky imaging from areas suffering from light pollution. Lets you capture astrophotographs in light polluted skies with CCD or DSLR cameras by blocking up to 99% transmission of specific wavelengths responsible for light pollution while passing through vital light wavelengths for pleasing images. Enhances contrast of all types of deep-sky objects: galaxies, nebulas, and star clusters. Preserves neutral color balance, eliminating need for corrective color processing later. Enables longer astrophotography exposure times without background saturation due to sky glow pollution