I am very much a cat person and I have eight cats at present so I am quite interested in your question.
1. The first thing to say is that cats do have very different personalities so the sort of behaviour you mention is unpredictable depending on the individual cat. Some cats will be very curious and would approach strangers with a camera, other cats will always be wary of strangers and would run away, but the majority group would be indifferent unless interfered with.
2. Another factor is where the encounter takes place, two of my cats are quite friendly both towards myself and strangers in our yard, but when I am out and about outside and encounter one of them they will be very wary even of me who feeds them. So clearly behaviour may differ depending if encounters occur either on or off the cat's established home territory.
3. I think that the bot***** *****ne is that cats are largely creatures of instinct and domestic cats are not so far removed form wild or feral ones so their survival instinct would be to flee from uncertain situations. I am not sure if the camera adds or detracts from the situation ...
I hope I have covered your question fully enough but if you would like further clarification or to talk things over a bit more then I will be on-line for the next hour or so and I will be more than pleased to continue working with you.
Please be kind enough to rate my service to you after we have concluded our dialogue, such feedback helps me maintain the quality of my answers.