Bit late on this reply, anyway just wanted to add something seeing as it has risen up again....Don't forget that it will take a while to shoot candids and/or street with a TLR if you haven't done it before. There's a definite adjustment period required. Once you start to get more comfy it with it though, it a TLR can be a real weapon for that kind of thing. For God's sake, do use a hood with that camera though. I shot all of these on Rolleiflexes and even in the ones where it looks like the people knew, trust me when I say that they really didn't know...
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One thing that you already touch on also is that these kind of cameras are either met with indifference or a smile, both can work well for public photography, depending on your aims. It's never happened to me that people have reacted negatively to such a camera, they don't appear threatening at all. That said, after a while you might actually start to find the strangers striking up conversations with you about 'that quirky looking camera' around your neck can actually get in the way of your shooting a bit LOL!