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Message: <blockquote data-quote="Pierro" data-source="post: 45248" data-attributes="member: 8517">Extension tubes cut down light, the longer the tube, the more light is lost, so in effect, you are stopping down, even if you dont move the ap ring. The only difference between a tube and a TC is that tubes have no glass, so IQ isnt affected like adding a TCIf you are on A or S priority, you'll see the camera metering to accommodate the loss of light.You can easily test this by using a static subject, in decent light, and simply shoot ( or even just watch the metering ) without the tube, then quickly add the tube, use same settings ( stick to A priority or S priority - dont swap between them when adding the tube )Hopefully if the light is stable and hasnt changed at all - you'll see the metering compensate and by how much.</blockquote>