I have a subject who suffers from camera anxiety. She doesn't shy away from the camera, but she gets uptight or tense when her photo is taken. I've seen her impromptu or spontaneous smile and facial expression in social interactions numerous times, and it is quite different from nearly every photo of her (unless she was not aware that her photo was about to be taken). Have you ever encountered this and if so how did you approach it? Any good primers or discussions about camera anxiety and what to do about it?