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Message: <blockquote data-quote="Woodyg3" data-source="post: 775555" data-attributes="member: 24569">The 2-500 was sharper than the Tamron 150-600, and not much different in weight, so I was happy with it for quite a while. I did have occasional problems with the lens not communicating with the body. The bottom line, though, is that the 500mm PF is quite a bit sharper, it's lighter, and AF is about twice as fast, IME. I finally felt like I could afford the lens, so I went for it. I did have some hesitation about selling the 300mm, but in all honesty it was collecting dust. The lack of VC and the overlap with the Tamron 100-400 that I am keeping were the reasons to let the old timer go.</blockquote>