Mirror…Mirror… A guide to choosing and using mirror lenses Part 1 – Wayne John Grundy's PhotoTech Blog
500mm Mirror lens review Vivitar for Canon - YouTube
Vivitar 500mm f/8.0 Mirror Lens with 2x Teleconverter (=1000mm) + Tripod + 3 Filters Kit for Canon EOS Rebel SL1, T3, T3i, T5, T5i, 70D, 6D, 7D 5D Mark II III Camera Reviews 2023
Unusual review: 500mm mirror lenses tested on the Sony – sonyalpharumors
Amazon.com : Vivitar 500mm f/8.0 Telephoto Lens with 2X Teleconverter (=1000mm) + Monopod Kit for Nikon D3200, D3300, D5300, D5500, D7100, D7200, D750, D810 Camera : Camera Lenses : Electronics
Making it as a Pro: Lens Review: Opteka 500mm f/8 Mirror Lens
Vivitar 500mm F/8 Mirror Macro Manual Focus Lens with T-Mount Adapter For Pentax K Mount {Rear 30.5} at KEH Camera