If what he was saying is true than all hand-held light meters would be useless. You would need to input what camera, what lens, what focal length. Of course, this is not true. Light is light. A hand-held meter measures this light and gives a reading based on the photographer only inputting the ISO setting. Of course, all digital processors in each manufacturers camera will read this light slightly differently, but a difference of a stop (ISO200 - 400) seems very unlikely. You will certainly get a variance in the quality of the image between a kit lens and top end L series lens (barrel distortion, fringing etc) but not in exposure.
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