That might be the same as I've discovered when I pull out a 1930's folding camera: People relax and smile, instead of stiffening up and looking hostile as they do if you aim a recognisable modern camera at them. The "drawback" is the incredible amount of invitations to "come and have a look - my grandfather had a camera just like that, I'm sure I can find it in a drawer somewhere"... it's (almost) invariably a Kodak Instamatic.