Lumicon UV Dust Seals keeps dust and insects out of your telescope. The filter used is a plane-parallel polished surface substrate that blocks ultraviolet radiation but passes all visible light with minimal absorption, no aberration, and no noticeable internal reflection. The filter mounts on the back of your telescope and accepts all attachments. Fully Multi-Coated.
To ensure that your Lumicon filter remains the World's Best, the strictest quality control standards are employed throughout the production process. Each Lumicon Filter is individually inspected for maximum quality assurance.