If it is a really expensive camera as in "Professional", I would advise you to do so. Otherwise, don't worry about it. I have crossed the Atlantic 72 times and until I started carrying guns and scopes, I didn't know what a 4457 was.
Should I list my camera on it? Yes/No?
Their sense of humor is usually AWOL.I do, it's better safe than sorry. Never had a customs agent snicker.