A good portrait captures a genuine expression or an unguarded moment, and these typically come only when someone is having a great time and forgets about the camera.
Upon the invention of the camera, it was the portrait that took precedence.
画像一直很受欢迎，直到照相机发明。
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Now, you can go ahead and shoot at F4 with shutter speeds up to the Max the camera has available. And you still achieve that precious look that we all want; a portrait with a blurred background.