<p>Hello guys, I bought used 80-200mm f/2.8D (2 Ring Version) from Keh. I've doing some test shots and I realized this softness at 200mm f/2.8. At f/4, it is sharp and it is sharp throughout the focal length at f/2.8, just not at 200mm. Here are some images. Is this normal? Could it be the haze?<br /> <br /> 200mm @ 2.8<br /> http://imgur.com/pE1WjuV</p> <p>200mm @ 4<br /> http://imgur.com/qTEoglR</p> <p>135mm @ 2.8<br /> http://imgur.com/4O87jp8</p>