When I've attended SOI shows in the past, the arena staff has always objected to a DSLR because of it's movie-making capability. However, when I carried a non-digital SLR they only wanted to know how big my lens was to make certain it was under the 200mm limit. The last time I took my DSLR to the show I got hounded by one particular usher who was dead certain that I was recording video with it because I took a long time to set up a shot ( he didn't have a clue how a digital camera works, lol, although he didn't admit that). Before intermission he approached me, with a security escort, yet!, and told me to go with them to the arena office for a discussion about the footage I was "supposedly" taking. I wasn't at all worried because I knew there was no video on the memory card---I wasn't taking any, lol. Needless to say, the usher had a considerable amount of egg on his face when his suspicions proved to be wrong. I did have to scroll through all the photos on the card to prove there was no video on it, though. In talking to the supervisor of the ushers I found out that the arena staff prefers non-professional photographers to bring non-digital SLRs because, with them, they are sure no one is taking videos; they know they can't be everywhere to police everyone. All in all, it was not a very nice experience. I hope no one else will have to deal with anything similar to it. After that, I stopped taking a camera with me; it was simply too much hassle to put up with.