Fascinating topic
Okay, I'll confess: I am intrigued by street photography, but I do very little -- almost none -- of it. In my distant past, I have done the corporate equivalent of street photography . . . where I was assigned to get picture of people being candidly themselves while being as unobtrusive as possible. I managed this with a 135mm lens, high speed film, and available light.
To me, that is the soul of street: to capture people being themselves while shooting unobtrusively. Henri Cartier-Bresson embodies that ethos, in my opinion. I've read a couple of stories about how HCB worked, and it seems that he aimed at being the invisible man.
Contrast that with some of today's street photographers, who insist on using wide angles lenses and then moving in very close to fill the frame. I have even seen one "street" photographer blazing away with mamiya rangefinder and a flash at a distance of about 7 feet. It seems to me that what these photographers are capturing are not pictures of people being themselves, but people reacting to the intrusion of a photographer.
Recently, I covered a steamboat rally in Waterford, NY and captured this picture:
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I don't claim it is great photography or great street. It was shot at 78mm equivalent. I'm pretty sure that the gentlemen in question did not know that he was being photographed. My wife and I later had a long conversation with him about steamboats. He saw the camera around my neck and never mentioned it.
For me, the ethics are pretty simple:
1. People in public places are fair game.
2. Be unobtrusive.
3. Treat others as you would like to be treated.
Cheers, Jock