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Message: <blockquote data-quote="downunder" data-source="post: 369671" data-attributes="member: 29516"><p>It was concluded in another forum that it is a non-functioning aperture problem that results in a one stop aperture change giving a two stop shutter change. The most likely suggested causes were a bent stop-down lever, a weak spring causing the aperture to stop down slower than it should, or oil or grease on the aperture blades causing it to stop down slower than it should. I don't think the seller intentionally sold me a faulty lens. He didn't even know that this lens could be used on modern digital cameras and last used the lens in 2000. I think he simply didn't test the lens before putting it up for sale, possibly because he no longer has a camera to test it on.</p></blockquote><p></p>