Hi, I used to own a 1000D and a 450D before my 40D, and all three seem to under expose a grey card by about 1/3 to 2/3 of a stop, so to get the spike to the middle of the
histogram, I usually have to over expose by 1/3. First question is: is this expected behaviour from any camera make/model, and secondly is there. A possibility that an 18% grey card isn't actually what it ought to be, ie. ...