ENHANCED COMPATIBILITY - Seamlessly adapt your M42 screw mount lens to a Leica 39M body, expanding your lens options and camera versatility with this adapter. PRESERVE IMAGE QUALITY - Maintain optimal image quality with a precision-engineered adapter that ensures a secure and accurate fit for your lenses, preventing light leaks. DURABLE METAL ALLOY BUILD - Crafted from high-quality metal alloy, this adapter provides a robust and reliable connection, ensuring long-lasting performance and durability. LIGHTWEIGHT DESIGN - At only 1.3 oz (38.0 g), this adapter adds minimal weight to your setup, making it ideal for photographers on the go who value portability.