[ciaran]

The concept of 18% gray holds true. I do agree that camera manufacturers can't agree exactly on what tone 18% gray actually is, so their meters are calibrated slightly differently. But this tutorial was kept as agnostic as possible in terms of camera manufacturers and indeed whether the user was shooting digitally, on film or using a hand held spot meter.

Originally Posted by clickmepp

Concept is well explained...Just I wish to add few info about Camera Metering...

Nikon/Canon internal Meter is calibrated for 12-13% NOT 18%, which is 1/2 stop lesser than 18% Grey. So if you use grey card to set the exposure we need to add 1/2 stop to the displayed value to get perfect exposure.

Note: Calibrate the camera against 18% grey card and Histogram....I did my Nikon gear found 1/2 stop difference, which means internal meter is 12-13% Grey. It is also well documented by Thom Hogan in his website.

Originally Posted by JimAuburn

Another great tutorial. Have you seen this megathread on exposure?

Thanks I didn't see the thread at the time of posting. I was asked to post some of my tutorials here, so I did so without really checking what tutorials or information was here already. Apologies for any duplication