In article <4t18k4$h3v@epx.cis.umn.edu>, cheu0018@maroon.tc.umn.edu says...
>How to take a pictures of people you don't know?
>do you usually just go in front of them and press the button?
>or do you have to ask for permission first?
>What kind of len do you use? 80-200mm???
>I always want to take pictures of different people when I go travel
>and really afraid they get mad of me if I don't ask.
>Do you have any experience that you can share??

I find it easier to get close with a wide-angle not pointed directly at
someone, and either look distantly past the people photographed before and after the picture, or show the subjects that you are having fun with them
while taking the pictures.... I can't shoot people I don't know (unless
hired to do it in a context in which they would expect me to photograph
them) with a long lens ('cept a 500mm mirror ;-) - it is too obvious
who I am aiming the long lens at, and the subjects and I both get uneasy.
Hope This Helps