I read a rather silly article over at PetaPixel: Photog Denied Park Permit Because His Mirrorless Camera Lacks a Mirror. Having gone mirrorless since last December with the GH2, I took offense at this nitwit in charge at a Navajo Tribal Park, Antelope Canyon. I got miffed when I was not allowed to take my Olympus E-3 with a old Tamron 300 f/2.8 into so called public stadium called SafeCo field. It is a private team that plays there so I guess they have the right to rule who shoots there. They told me I looked to professional with my big lens. I guess the Navajo's got it in reverse.
The photographer, Gordon Laing, the founder of Cameralabs, found out the hard way that you should not bring a mirrorless camera there if you want to be treated as a professional. He was using a Panasonic GX-1. Only professionals are allowed to go and shoot unescorted. Never mind according to wikipedia.org, “Antelope Canyon is the most-visited and most-photographed slot canyon in the American Southwest.” He said when he had been there before he had bigger camera with mirror. To see if he was a professional the goon asked hime if his camera had a mirror.
I guess most places don't realize that our mirrorless cameras are just as good as our mirrored brethren. May be this is a good thing for must situations as in stealth. I hate permits anyway because I take pictures or video anyways. (with or without permission)