Secure threaded protection - Female thread design lets you screw the dust cover directly onto the lens interface for a secure, reliable seal that shields the lens from dust and scratches. Lightweight and durable material - Made from premium aluminum alloy for a lightweight construction that is easy to handle without adding bulk or weight to your setup. Broad compatibility - Suitable for astronomical primary mirrors or photographic sockets with a corresponding size thread, making it versatile for various lenses and setups. Precise fit and reliable protection - The lens cap is designed to fit perfectly with the magnifying lens, ensuring effective protection and minimal risk of accidental displacement. Practical use scenarios - In the field with a telescope: attach the dust cover to protect the lens interface when not observing, during transport, or between sessions. - In photography or studio setups: keep dust and debris away from lenses during lens changes or when switching between accessories. - During travel or storage: use the cap to safeguard the magnifying lens from scratches and dust in cases and wardrobes. Key attributes at a glance - Function: threaded dust cover that screws onto the lens interface for secure protection - Compatibility: fits astronomical primary mirrors or photographic sockets with matching thread size - Size: designed to correspond to the magnifying lens and ensure a snug fit - Material: lightweight premium aluminum alloy - Performance: protects the lens effectively while remaining easy to use