I have a question that I haven't seen answered anywhere on the Web. I thought that maybe someone here would have an answer. It's a very practical question in fact, since it clearly affects my photography in the field.
I just bought a Nikon D300 with a 50mm 1.8 lens and an 85mm 1.8. When I did a portrait of my wife in landscape orientation (the usual for the camera), her face seems a bit larger than life, a bit stretched on the horizontal and less long in the vertical axis. When I rotate the camera in portrait orientation, she seems thinner than usual. I tried to keep the same distance for the two situations but it always does this strange effect. Of course, she likes looking thinner, but I was wondering why I can't make her look natural with the normal orientation of the camera. Is there a physical reason to that ? The effect seems worse with the 50mm than the 85mm. I put her face on the left side of the picture for a better composition while in landscape orientation. My distance to the subject is about 1 meter to 1.5 meter and a half with the 50mm, just enough to have only her face in the picture while in landscape orientation.
Thank you very much and please excuse my English, I'm a french native.