Interesting: thanks. I assume that "6" applies to the physical length, not the focal length, but where are they measuring from? The back of the camera, or the lens?
Why would anyone who'd read that lot bother to go? But at least they warn you in advance. What gets me are the arseholes who invent new rules when you arrive, or who have old but generally ignored rules in tiny print at the entrance when you've taken the trouble to get there.
Something I've done sometimes, especially in shops who want you to hand over your camera bag, is to say, "Yes, I'll leave my cameras with you, if you w¡ll sign a receipt accepting full responsibility for $10,000 worth of cameras." Strangely enough, no-one has ever taken me up on that...
Cheers,
R.