HQ Optics 500mm f/8 Mirror Lens M42 T Mount & Caps (#13140) | eBay
Samyang MF 500mm F8.0 Mirror Lens M42 Mount - DSLR, CSC Telephoto Lens, Manual Focus, Filter Diameter 72mm, for Full Frame and APS-C: Buy Online at Best Price in UAE - Amazon.ae
Amazon.com : 500mm f/8-32 HD Preset Telephoto Lens for Olympus OM-D E-M1, E-M5, E-M10, Pen-F E-PL8, PL7, P5, PL5, PM2, P1, P2, PL1, PL1s and PL2 Micro Four Thirds Digital Cameras :