Using an internal meter off of a grey card is the same as using a handheld incident light meter.
An incident reading is much more effective than a reflected light reading. I have attached a link that shows the concept well.
Using Gray Cards
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Kodak Z1012, Pentax PZ10, PZ1, Bronica ETRS, Mamiya C330
Pentax FA 28-80, FA 100-300, FA 1.4 80, AF 330 FTZ
Bronica 75, 150, AE-II Finder, 120 Back, 220 Back
Mamiya 55, 80, 180
Vivitar 2000, 283, 550 FD/Weston Master II,Wein Flash Meter
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