Crikey that's pretty restrictive! I did pack a couple of teleconverters with me incase I needed them, maybe the 200mm limit might not be so bad if you can sneak in a 1.4x/2x tele...Lumen Field (pro soccer, football) here in Seattle limits you to 200mm. At T-Mobile Park (pro baseball), it's "Cameras smaller than 6 inches with the lens fully extended are allowed".