In looking back over my archives I’ve discovered how many images I underexposed. I’m not sure the reason. I do know that the D300 I shoot now does meter on the underexposed side and I think that’s to keep from blowing out the highlights. The camera has a menu option to fine tune your cameras metering. I have mine set to +1/3 and seems to work for me. And, over the years I’ve learned to expose for the highlights and bring out the details in the shadows during post processing.