I have an issue for some time now where images I shoot at 200 mm at 2.8, 4, and to some degree 5.6 are blurry. They are not out of focus, but the images have a soft, blurry quality to them. I suspect the only way to resolve this is to send the lens in for repair, but was wondering if anyone else had similar issues and has a diagnosis. I have attached a sample image. Thanks