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I have a Pentax SMC-DA 18-55 kit lens that is often soft/blurry at one side of the frame. I assembled this image of test shots that shows the problem.
I looked it up and lens de-centering could be the reason. Can't see anything wrong with the lens, but when I shake it gently there's a slight rattling or clunking sound. Is there something I could do to fix it?