So I often read about setting the exposure from the sky or water or some other part of the composition from the center. I am also aware there are different types of exposure meters, but what I am wondering is how do you set you exposure from say the corner of you composition (lets say its the sky). You could simply press down the shutter button halfway to get an auto exposure setting and than re-compose the photo, but wouldn't that also auto focus on the corner of the picture... which is not something I would want. What If I want to meter the exposure form one side of the photo and focus on the other side. How would I do this without going full manual? I use a T3i.
