Sigma 600mm f/8 Manual Focus Super Telephoto Mirror Lens for Canon E

(USED - Good Condition) The Sigma 600mm f/8 Manual Focus Super Telephoto Mirror Lens is a vintage, ultra-compact reflex lens that uses a combination of mirrors and glass elements to achieve an immense telephoto reach at a fraction of the size, weight, and cost of traditional 600mm lenses. While highly portable and affordable on the used market, it features an unwavering, fixed f/8 aperture, strict manual focusing, and a distinctive "donut-shaped" background blur (bokeh