I was reading about metering (at this link: http://www.photography.ca/phototips/meter.html
) and how to do it .
From reading that, I don't understand. If I am about to shoot a portrait of a posed subject, they are telling me to first fill my frame with a grey card, focus on it and "use that reading". Use what reading ? It makes me think they are saying this "reading" if you will, is stored somewhere or shows on the camera somewhere since they said "dial that reading into the camera".
Looking through the viewfinder inside the camera, I usually rotate the command dial until that +/- meter in the camera is at 0 (zero)...right in the middle. Is this the meter they mean ?
If so, that loses me. Cause if I fill the frame with some grey card and dial that meter to 0 (zero).....then when I move back to my subject, I'd have to focus on them and change that +/- all over wouldn't I ?
Please explain for me please. Is there a link that's better than the one in this message for explaining "EXACTLY" how to do this ?
Thanks

