I think this is unused , it’s in great shape
Centon 500mm F8 Mirror Manual Focus Prime Lens Olympus OM Mount
Centon 500mm f/8 MC Telephoto Canon EF Mount Manual Focus Mirror Lens refm
Centon 500mm f/8 Reflex Mirror Lens - M42 Mount *haze*
Centon 500mm f/8.0 Compact Mirror Telephoto Lens, Manual Focus, 12 Mount
Nikon Reflex NIKKOR C 500mm F8 Black Super Telephoto Mirror Lens Bird Exc++
TAMRON SP 500mm F8 Tele Macro Mirror Telephoto Lens for Canon EF Mount Exc++
