This product is the H&Y StarKeeper filter.
It helps reduce the appearance of light pollution when shooting at night with your photo or video, removing illumination from artificial light sources such as street lights.
- Astrophotography filter makes the stars pop when shooting at night with clear skies, reduces warm cast from Sodium vapor lamps
- 100mm x 100mm with installed magnetic frame
- Compatible with Any 100mm H&Y Filter Holder with pre factory installed magnetic frame
- Square 100 x 100mm 2mm
- 9-Layer Multi-Coating
- Water and dirt repellent coating
- Filter Pouch and lint free cleaning cloth