That's exactly what I'm saying, because you are obviously new to photography before you start laughing, at facts your'e "pretty sure" about, watch this video and it will explain that individual DSLR sensors give different responses to light. and how some light meters can be calibrated to each cameras individual sensor http://www.youtube.com/watch?v=tdyosItw3Mk

I am pretty sure if you meter with an EOS 3 with a Canon 1dmarkIII on the same scene, you get the exact same reading.
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