The photography business is 90% business... firstly
secondly, to 2100 .. an unfortunate incident indeed but i don't believe it's wise to simply write off a bad experience as just blaming the "customer".. You may know the stats that when customers have a bad experience they on average tell...
some cameras have long exposure noise reduction or high ISO NR as built in options... otherwise shoot raw and do it in post with specialist software like Noise Ninja.. they can be very effective.. as previously stated.. it's a trade off.. ISO vs Shutter Speed. Naturally higher end cameras will...
Just take the photo and if the person sees you go up and show them the picture and thank them...you might get a second close up... far more interesting for street photography is to engage the subject...walk up to people.. smile, ask politely and you'll be amazed at how friendly most people...
Spend a day with Jim Holmes, learning from his experience in photographing for 2 decades throughout Asia and Africa. Jim is especially passionate about photographing the people he meets on his travels for clients such as Oxfam, Unicef and the W.H.O.
Having spent the last 14 years in Laos...