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Message: <blockquote data-quote="Elliot87" data-source="post: 472239" data-attributes="member: 25183">It is difficult to judge from those pictures and without exif information (shutter speed, iso etc.) It would be better to take a picture of something closer with fine detail. Most lenses will perform better with the aperture stopped down a little, so instead of using f/5.6, try f/8-f/11. That certainly improves sharpness with my 70-300mm. It is also likely to get softer at 300mm so take some pictures at say 270mm, 250mm and 200mm to see how they compare. All lenses are different so you will have to find where this one performs best.Of course using a lower ISO will also help so long as you can keep a fast shutter speed. Apologies if this is information you already know but I know it would have helped me get better results right away when I got my 70-300mm Tamron</blockquote>