I'm looking to purchase a prime tele lens for shooting sports. But I don't know what i need. I know what i want. The ability to shoot a subject from far away to at min 33% of the image. So my max distance from the subject would be like I am near the 50 yrd line (football) shooting a hail mary pass into the endzone on the opposite corner. I think thats like 240-270ft I believe.