For example, I photographed this target, camera on A priority, legacy lens.
Looking at the LR3 histogram on the right, the result should be with middle grey in middle of histogram and black and white levels about equally in from their respective sides. Obviously, this is a well used card which has gotten dirty, so one might expect a very slight shift to the left as a result, but not this much... it takes about +1 EV adjustment in LR3 to bring the image where it should be (see bottom image.)
I have found a similar result when photographing common subjects/scenes with the legacy lenses in "A" mode.
Here's a resulting image, with what I consider to be proper and accurate tonal representation - after the +1 EV compensation:
Understandably, a subject with a significant area of brighter than 50% grey tones would tend to cause the in camera meter to under expose somewhat, but this subject and the test card itself shouldn't be causing the meter to under expose by 1 stop.
I may just be that this meter or this sensor are a little more "off" standard than a typical camera and I need to understand where and when it causes this and compensate for it. I was just wondering if anyone else had experienced this.