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Message: <blockquote data-quote="Marcel" data-source="post: 369422" data-attributes="member: 3903">It could very well be that the aperture blades are a little tight (sticking). When this happens, the blades don't have time to close for when exposure happens. Remove the lens and play with the little aperture lever to see if they open and close very freely when you change the aperture on the lens.Are you also using the aperture ring to change your aperture? With my manual lenses (without CPU), I have to use the actual ring to change exposure.Another point is that these manual lenses only work with matrix metering...Good luck.</blockquote>