Asking for field access starts by submitting a formal request to the Athletic Department's secretary. I say formal because you have to be professional how you approach this so they take you seriously and to present yourself as a professional.
In the request ask for the secretary to forward the request to the AD's for consideration and that you would appreciate a response either in writing, phone call or email, whichever you prefer and it also depends how you submitted your request.
In the request include your full name, webpage, email and other information for contacting purposes. Then introduce yourself by stating your experience or your desire to get experience by shooting their team(s), what services you want to provide and what your intentions are with the pictures. In other words, is very hard to give access to someone who is a stranger so use this opportunity to not be one. Your writing style should be friendly, approachable and courteous at all times and remember that you're the stranger to them so you have to make the best out of it.
Once you get access to the field the AD usually has a "Media Circle" drawn for this purpose, it is located by first base which is a great spot to cover 3rd base and home while you have a long lens. If you have a 70-200mm then you can cover all four bases etc. The media circle is the are that is assigned to you for shooting purposes.
Be very careful not to talk to the coach, players, umpires during the game, unless they talk to you you're okay. Also be careful to follow the umpires rules at all times, umpire rules/request/directions should be strictly follow or they will throw you out of the field for not following their rules and not showing respect to them, the game and the athletics.
If you're allow to roam around make sure you ONLY DO IT between innings so that you do not disturb pace of the game.
If you do not get field access you can still shoot through the fence(s) by placing the lens as close as possible to the fence you're shooting through, this will help you get the fence out of focus and out of your way. Sometimes if the sun is hitting the fence then you might get a reflection, when that happens move to an area that doesn't one or have someone hold an umbrella over you to minimize the reflection. If you have a double fence area the only solution for that is to get a ladder and shoot over one of the fences.
Best spots to shoot from:
first base, third base and right behind the catcher by the stands.
This can go on and on but I think you get the idea.
If you look at my pics in my gallery, all were shot through a fence and from the spots mentioned. I'm in a new city and I just received field access this week so I won't be shooting through the fence anymore except the pitcher's shots of course.
here's my website: www.passionforsportsaction.com
--William
Canon 20D, Canon 40D, Canon 580EX, Canon 50mm F1.8, Canon 18-55mm, Tamaron 28-75mm, Canon 70-200mm F2.8 IS, Canon 300mm F2.8 IS