Want a better understanding of how the metering and AE-lock features in your DSLR camera work? YouTube photography tutorial channel PhotoUniverse made this simple explanation that explains the concepts using a whiteboard. He quickly steps through evaluative (which uses a database of many “known” photos) and center-weighted metering before spending a good amount of time explaining spot metering and how you can use it in conjunction with AE-Lock to properly expose photographs.
If you’re already adept at handling your DSLR, you probably won’t learn anything new, but this video is great for anyone that’s just starting to dip their toes into more serious photography.
P.S. He also shares a common trick used by many photographers for metering on a sunny day: green grass can often work nicely as an 18% gray card.