How easily we are fooled by our hand held meters! I always use my meter at weddings, but as I have adopted the EV system, I have noticed that the settings do not vary much at all. It is all too easy to rely 100% on the meter and ignore your judgement. Using Equivalent Values (EV) one is presented with just one number, usually 13, in shaded summer, so any number that departs more than 2 either way is suspicious! Get used to one film speed and one meter, and you will find that one basic reading is all that is required, making minor adjustments in your head for changes in the scene.