Optolong Clear Sky for 82mm Camera LensDescription The relentless spread of urbanization and its associated light pollution have become a growing problem for all amateurs and astrophotographers. The Clear Sky Filter provides an economical and practical solution for use with your standard camera lenses to cut back light pollution. Screws onto the front of any lens that accepts 82mm filters. (If your lens uses a smaller filter thread, adapters are available separately.) 82mm standard lens