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Are you sure you have the spacing exactly right? I've experienced similar on my Nikon adapters. It's not sufficient to be in the focal range, but rather if your lens isn't focusing very close to it's infinity mark then it makes things much worse around the image. This is worse on wide angle lenses than telephotos in my experience.
If you have the spacing right then it likely really is just a sharpness issue. I typically shoot at f/4
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