Manual focus telephoto mirror lens made for MD-mount SLR cameras by Minolta. Because of the mirror design, the aperture is fixed at f8. The lens uses rear-mounted filters with a 39mm thread. Details ・Model: Minolta RF Rokkor-X 500mm f/8 ・Focal Length: 500mm ・Maximum Aperture: f/8 ・Focus Type: Manual focus ・Optical Construction: Catadioptric (mirror) lens design ・Minimum Focusing Distance: Approx. 5 m ・Filter: Rear gelatin filter slot (no front thread) ・Aperture Blades: Fixed (ring-shaped bokeh typical of reflex lenses) ・Weight: Approx. 600–700 g ・Made in Japan The lens is in very good condition, especially considering its age and size. Everything works as intended. The focus ring turns smoothly. It shows some small marks and scuffs on the body, but the glass is clean. The item will be packaged and shipped with care.