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Message: <blockquote data-quote="Clovishound" data-source="post: 844909" data-attributes="member: 50197">Well, the last two you posted were taken at 1/40 sec, and appear to be very soft center to edge. My guess is camera shake. The first two were both sharp in the center, and were taken with a rather high shutter speed, which would overcome camera shake. The first posted Tamron image looks sharp in the center and soft on the edges. That could be the lens, or could be focus. The Tamron gets good reviews from this review:<a href="https://kenrockwell.com/tamron/24-70mm.htm" target="_blank">Ken Rockwell</a>Of course, you could always have a bad copy of a good lens. I would recommend testing the lens at F/8 or F/5.6, and try for a lower ISO, around 100 or 200. You will either need a fair amount of light, or use a tripod to make sure that camera shake isn't inducing blur. I would prefer a tripod to ensure no shake. I would shoot a subject that is flat, say a fence or wall, and is parallel to the camera. That way you can make sure that the lens is sharp from center to edge, without focus being different between the two.It's also possible that the Tamron needs to be adjusted for your camera. There is a procedure where you can fine tune auto focus of a lens. This is a one time procedure, and once you do it, the camera will automatically apply this adjustment whenever you use the lens with that camera.</blockquote>