I have seen in discussion where someone is told to meter off of, say the black door.
How do you do that? Does the camera meter the scene from the center of the lens? I'm sure there is a difference in spot meter VS matrix metering when pointing the camera in a particular scene.
If we stay with the black door. If the black door is to the left of the yellow wall in the scene, I'm guessing spot metering will read from the yellow wall. Matrix will read from the entire scene.
Now, what if I wanted to meter off of the door but keep my composition? Do I point the camera to the door while on spot metering, exposure lock, then re-compose?