SOLD OUT Are the glass and thin film solar filters safe? Yes, all of our filters are safe, blocking up to 99.99% of the sun’s rays, perfect for unlimited visual use as well as photography. These filters are rated with a neutral density of 5. With proper care and handling, our filters will last for many years. Spectrum Telescope meet ISO Certified 12312-2 American Astronomical Society https://eclipse.aas.org/resources/solar-filters