Protect and preserve your astronomical or photography equipment with this high-quality Lens Dust Cap, designed specifically for lenses and mirrors featuring M42x0.75 external threads. Crafted from premium aluminum alloy, this dust cover combines durability, lightweight design, and secure fit to ensure your lenses remain clean and protected in any environment. Key Features: · Precise 1:1 Molded Size – With a diameter of 42mm and a thread pitch of 0.75cm, this dust cap fits perfectly on astronomical primary mirrors and photography sleeves with M42 external threads, providing a snug and reliable seal. · Secure Screw-In Design – The internal threaded structure allows the dust cover to be screwed directly onto the lens interface, reducing the risk of accidental falls and offering stronger protection compared to traditional snap-on covers. · Lightweight & Portable – Weighing only 13 grams, this dust cap is easy to carry and ideal for both indoor storage and outdoor use without adding any unnecessary weight or bulk. · Durable Aluminum Alloy Construction – Made from high-grade aluminum alloy, the cover is wear-resistant, weatherproof, and built to withstand extreme weather conditions, delivering long-lasting protection and reliability. · Comprehensive Lens Protection – Effectively prevents dust, dirt, and debris from settling on your lens surface while guarding against physical impacts and harsh outdoor elements, helping to maintain lens clarity and performance. Specifications: · Item Type: Lens Dust Cap · Material: Aluminum Alloy · Thread Size: M42 x 0.75 · Diameter: 42mm · Weight: 13 grams Package Includes: · 1 x Lens Dust Cap This aluminum alloy Lens Dust Cap is an essential accessory for photographers and astronomers seeking reliable, durable, and lightweight protection for their valuable lenses and optical equipment. Ensure the longevity and optimal performance of your gear with this precision-engineered dust cover.