I have a Sekonic 358 and had the same problems shooting with a 5D. sekonic says the meter measures a "baseline" from factory and can be adjusted with offsets by the end user. this is what i had to there is really no easy way to do this either.. it is trial and error and gets to be time consuming. in the end there is a time where i didnt trust my meter than after a month or so i can pretty much rely on it within a 1/2 stop.
Eric
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