Tokina announced a new SZ 500mm f/8 Reflex MF super-tele lens for Nikon F and Z mounts - Nikon Rumors
Mirror lenses: worth it? – Jonathan Gazeley
Review Samyang MC Mirror Lens 1: 8.0 f = 500mm. Super telephoto lens weighing 300 grams | Happy
Samyang MF 500mm F8.0 Mirror Lens Sony A Mount - DSLR, CSC Manual Telephoto Lens, 72mm Filter Diameter, For Full and APS-C Format : Amazon.com.be: Electronics
Pro Optics 500mm f6.3 Mirror lens - A hands-on review - Bob Atkins Photography
Anybody tried the Samyang 500mm Mirror Lens? - PentaxForums.com
Insane Samyang 500mm F/8 lens - YouTube
Samyang 800mm f8.0 review | Cameralabs
Long Tom (The Samyang 500 F8 ): Micro Four Thirds Talk Forum: Digital Photography Review
The Rokkor Files - Minolta 500mm f/8 Review
Samyang 500mm F/8 review for travel photography, how good is 100 Eur lens? – Travel photographer from Finland / Engineer on tour
Samyang 500mm f6.3 DX mirror lens – British Astronomical Association