I use sinlge point focus and matrix metering.
Recently with a group of photographers one was using spot metering but not fully understanding it. I know a little about using spot metering but could not answer the questions relating to how spot metering works when: -
1. You us multi point focus - where does the spot meter take it's reading if you move the active focus point off centre?
2. If you use single point focus and focus lock on a subject off centre I assume you also have to lock the exposure reading when you re-compose the shot.
Your thoughts would be appreciated.