The Rollei Astroklar filter, made of high-quality optical glass, is especially suitable for astrophotography and landscape photography at night. The Astroklar filter effectively reduces light pollution when taking pictures in the dark. The Rollei Astroklar filter uses a special coating that suppresses the typical light wavelengths of yellow and orange light, which are caused by the usual artificial light sources, such as street lighting. Nevertheless, the Astroklar filter behaves extremely neutral, especially in the IR light range, which is a great advantage for astrophotography.