A one time back in the 60s and 70s I worked for the world's largest news organization. Their photogs (including me) used the Takumar 500 for sports photography (Dodgers, Yankees, etc.) and it was a fine lens. We mounted 'em on Nikons and had a Mickey Mouse system like a car gear shift to instantly focus on first and third base, second, home, and the pitcher's mound. The photos were used in newspapers and magazines all over the country and it is one of my favorite lenses. Large, but a goodie. I think you bought a gem.