HOYA Starscape light-pollution filters feature special optical glass which selectively filter out the yellow and greenish light pollution coming from distant street lights, which often ruins nigh time and astro shots. The result is more natural-looking images and improved overall contrast. HOYA Starscape filters significantly reduce the amount of time required to correct colour cast in RAW post-processing - images rendered without these filters can become degraded at pixel level. The use of Starscape filters can also save a huge amount of time normally required for the post-processing of time-lapse sequences. These filters are made in Japan from the highest quality optical glass, they have low-profile filter frames and are ideal for using with wide and super-wide-angle lenses. They are available in a full range of screw-in diameters from 49mm to 82mm.