Vintage camera lens and case

Vintage Sigma XQ Ultra Telephoto 500mm f8 mirror camera lens. Made in Japan and has a tripod mounting plate and includes a carrying case. Lens measures 9 3/4” long x 3 1/2” at wide end, 1 7/8” at narrow end. Case measures 10 1/4” x 4 1/4” x 4 1/2”.