I have used matrix metering when I first got an F100 and shot slides and negatives but then switched to CW and sometimes spot metering. I felt that the matrix metering was calibrated for slides as it tends to underexpose, and the slides that I shot with matrix metering was much better than the negatives (mono and color). And since the matrix mode has a mind of its own, literally, I found it hard to compensate so I just stayed clear of it.