I was messing around with Light Meter Tools, an app for my samsung galaxy s4 Android op system. My Minolta IIIf light meter just broke. Bernard is right about that the reflected reading requires one stop more even with gray card. I was surprised figuring it would be the same. Is this the app or do your meters work the same way.
When I shoot landscape I usually bracket one stop click for negative and a half stop click for positive film in any case.