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Message: <blockquote data-quote="Marcel" data-source="post: 459308" data-attributes="member: 3903">I remember having such a problem because the little aperture tab was sticking, preventing my lens to close it's diaphragm. To test for this, try exposing with aperture fully open and then one at let's say f-8. If the one fully open exposes correctly and the f8 or f11 one is over, you've found the culprit. You can also remove the lens and extension tubes from the camera and while working the tab see if the diaphragm opens and closes. I suspect this could be your problem. For me, it only happened with the medium extension tube and with only one lens. The smallest and longest ones did not create this problem.Let us know what you find.</blockquote>