This is all about capturing
candid images of public places or even people in their natural element. A photographer in this case requires the knack to mingle between people and capture the best frames without being conscious of people around. Henri Cartier-Bresson used the technique of wrapping the camera inside his handkerchief. Of course, one also has to consider the legal issues, as there are many places where this type of photography is prohibited for security reasons.
A good street lens is anything from 28-85mm, preferably a
Mother and Daughter walking to school.
Sigma 18-50mm f/2.8 EX DC Macro HSM