I've been learning about the zone ruler and how to assess a scene and meter accordingly. However, I've also purchased a gray card and want to check if my understanding is correct as to why I would use this. If I expose according to the light falling on the gray card, when I remove the card from the scene (and my meter readings go crazy) I would ignore this and make no further changes to the setting
i.e. use one or the other, zone ruler or gray card, rather than both
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