Amazon.com : Haoge LH-M37W Metal Lens Hood for Leica Leitz Elmar 3.5cm 35mm f3.5 A36, Elmar 50mm f3.5 A36, Summaron 3.5cm 35mm f3.5 A36 and Other Lens with 36mm Outside Size Silver :
LEICA ELMAR 50mm f/3.5 Review
Leica Elmar 50mm F/3.5 Red Scale Standard Prime Lens L39 Mount w/ Filter and Cap | eBay
Buy Leica Leitz M39 9cm F4 Elmar Manual Focus Rangefinder Telephoto LTM Lens - National Camera Exchange