Was looking at Todd Papageorge's new book, "Passing Through Eden" last night. Photographs taken over many years in New York's Central park. Many of them, though made in daylight, make use of on-camera flash which not only increases detail in shadows, but gives a distinct flat look to some surfaces. Quite a different look in some pictures, more subtle in others.
Who else uses/used this technique? Dianne Arbus often did.