First off...
Welcome to PR.com!
You will find a lot of imitators, but we are the best! You will find a wealth of photographic knowledge and experience here, make sure you check out all the forums.

As for your photo, good first post. I can't say a 50 is the ideal choice for shooting basketball, but I can understand why you used it.

Keep Shooting and posting here!

Good Luck!
Brian