I recently went to my state's high school wrestling tournament - for the first time in 7 years. This is a public school event held in a public owned facility. The security entrance was an airport level gate. Metal detectors, 3 guards, and a list of prohibited items. The prohibited items included "professional cameras."
I asked the guard what they deemed to be a professional camera. The answer was quick and specific. "Any camera with a lens longer than 3 inches or a detachable lens." In the days since, I've done a little research and discovered that such camera bans are widespread, although the descriptions vary. Very few use the "professional" term. Most just say "large" cameras with a lens longer than X inches. Checking the websites of several US public universities, I found X varying from 3 inches to 8 inches.
The wording of the restrictions is very similar, indicating they might stem from a single source. But I can't find any information on the reason for this restriction. Is it for security reasons? Or is it to prevent the public from competing with media or pro photographers who have been hired to cover the event and sell their photos? If the reason is security, has there been a reasonable history of cameras being used as weapons?
Don't confuse this restriction with "no photography" bans at commercial events, like concerts, plays, and musicals. Those are for copyright protection. The restrictions I'm citing are all at public events in public venues.
So my curiosity is peaked. Please share your experience where you live. And if anyone knows the history or the real reason behind banning large cameras, I'd love to hear it.