I have decided to move up to a prime and really want to use the low light ability to take shots of my son's basketball games. (the light in most of the gyms he plays at is horrible, even with a speedlight.) I'm thinking a 28 will not be close enough. I prefer to take shots of my son's basketball games from just behind the goal but I think I will still need 50mm. Anyone have experience with either or would a zoom still be better. ( I don't think I can afford a 2.8 zoom.) Thank you for the help.