>Camera-generated bars are next to useless; you need a chart shot thru the lens, under the actual lighting conditions.
I'm using a Macbeth color chart AND a Kodak grayscale, but I think I'll start relying on my waveform monitor. The chart and grayscale card are mounted on a stand, where the subject would sit, under studio lighting.
I assumed there was a correlation between the 70% step on the grayscale and the 70% that the zebra stripes represent, but there isn't one.
70% zebra stripes represent 70% brightness, not 70% on a grayscale.