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Message: <blockquote data-quote="Steve B" data-source="post: 249182" data-attributes="member: 15754"><p>The inverse square law is only applicable for the distance between the subject and the flash (light source). If you keep the camera in the same location and double the distance between the flash and the subject the intensity of the light on the subject will be 1/4. Keep in mind that if you meter the incident light on a subject with a hand held meter the settings the meter gives you will be correct for the subject no matter what the distance between the camera and the subject.  Wait. Did you have the flash mounted in the hot shoe or off camera? To get an accurate test you need to have the flash off-camera as Pat said.</p></blockquote><p></p>