Minolta's late MD long tele — the 300mm f/4.5 for wildlife and sport, from the early 80s.
The Minolta MD 300mm f/4.5 is a long telephoto manual-focus lens for Minolta reflex cameras from the final MD generation of the early 1980s, when Minolta dropped the Rokkor name from most barrels. As a 300mm it provided serious reach for wildlife and sport in the mature MD system.
This is a manual-focus long-telephoto lens with a 300mm focal length and a maximum aperture of f/4.5, from the last MD line. Only the focal length and aperture are affirmed; other construction figures for this large lens are not confirmed here and are omitted rather than guessed. It succeeded the earlier MD Tele Rokkor 300mm f/4.5.
At 300mm the lens brings distant subjects much closer, suiting wildlife, sport and compressed landscape views. A maximum aperture of f/4.5 is respectable for this reach, though the lens is long and heavy enough that a tripod or monopod is advisable for sharp results with manual focusing at these focal lengths.
On the used market this is an uncommon final-generation MD long tele bought by collectors and long-lens users. Given its size and age, check the large elements for haze, fungus and separation, confirm the aperture works cleanly, and verify the focus helicoid and any tripod collar are solid. Inspect the coatings for wear before purchase.