Just got my new (to me) Soligor 500mm f8 mirror lens from circa 1975. It's still in near perfect condition and will probably stay that way for another 45 years. : r/BuyItForLife
For Sale - Soligor C/D 500mm f8 Mirror Lens With Macro Zone, Both Caps, Shade, Filters & Case | Photrio.com Photography Forums
Soligor C/D Mirror Lens F8 500mm for Olympus OM-1 OM-2 and - Etsy
Close-up photography with a Soligor C/D 500mm Mirror lens | Olympus/Zuiko