The SEESTAR-S30 and S30 Pro Dew/Light Shield with Filter is a high-quality lens accessory designed and manufactured in the UK. It is friction held and will drop off when arm is closed. It is an accessory for telescopes and binoculars, providing protection from dust, debris, and light glare to ensure clear and sharp images. The filter helps enhance contrast and reduce glare, making it ideal for photography and observation purposes, this product is a sturdy lens shield.