If you’re a darkroom beginner in need of a lens for 35mm enlarging I have two 3-element 50mm f/3.5 rebranded Marumi enlarging lenses that have just been taken apart, cleaned, and reassembled. The glass is now clean and clear and they work like new. They have the standard 39mm x 26 threads-per-inch Leica thread. You’ll need a retaining ring. Free to a good home in the continental US, one lens per customer. Please reply by PM with your mailing address.