Agreed Epcot Explorer.
Here's a quote from Mouseplanet:
Disneyland Resort increases enforcement of "professional camera" ban
If you plan to bring your high-end camera on your next visit to the Disneyland Resort, you might want to measure your camera lenses first. Several visitors to the Resort during the week leading up to the Miley Cyrus event reported that cast members were prohibiting camera lenses longer than 6" beyond the bag check screening tents, citing a ban on "professional cameras." The scrutiny was especially high on the day of the actual event, and one MousePlanet staff member overheard a cast member explain that "there are celebrities in the parks today!" as justification for refusing to allow the visitor to enter the park with a long zoom lens.
Officially, a Disneyland Resort spokesperson says "it has always been our policy that professional lenses are not allowed inside the resort without a public relations host," but some readers and cast members allege that the crackdown is a result of paparazzi behavior during a recent visit by actress Lindsay Lohan (link). Britney Spears, Victoria Beckham and Courtney have all had encounters with professional photographers at the Resort in recent years.
In discussions on our MousePad message board, several readers pointed out that they own amateur or "pro-sumer" lenses longer than 6", and wonder why the Resort is focusing on the equipment, rather than the behavior by celebrity photographers (link). It's likely that this heightened enforcement may be relaxed now that the big event is over, but we've asked the Disneyland Resort to clarify their definition of "professional" equipment so readers know what to expect on future visits. We'll share their response in a future Update.