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Message: <blockquote data-quote="Eyelight" data-source="post: 411878" data-attributes="member: 24753">If shooting in any auto mode or using the meter in manual and there is a light source behind the camera it will affect the metering.  Even just a table light might change the exposure by a stop.  If it is dark and no light source, not so much.Just hold your camera up with a light striking the viewfinder, then cover the viewfinder with your finger and watch the metering change.Edited to add:  Not as big a deal when using live view, because Live View is using the sensor to meter the scene.  You could experiment and see if a strong light hitting the viewfinder affects the Live View metering.</blockquote>