Tamron SP Af28-300 f/3.5-6.3 Xr Vc Di

If you want a lens that can give you the ability to reach out and capture distant details of wildlife, and sports action photography – the Tamron SP AF 28-300 f/3.5-6.3 XR VC Di is your best bet.

This amazing 11X extended range wide-to-super tele zoom covers both full-frame and consumer DSLR (APS-C) formats allowing you to focus down to an incredible 19.3" -- or 1:2.9 -- for breathtaking close-ups. If there's any compact zoom that does it all on digital and film SLRs, this is it.

The lens is not only one of the best performing zoom lenses, but it is also the smallest and lightest. The use of low-dispersion lens elements help reduce chromatic aberrations, such as ghosting, flare and distorion. This also allows for sharper images with great clarity.
Meanwhile, its Extra Refractive Index glass helps keep the lens size compact, while not sacrificing its lens speed and quality.
Tamron's Internal Focusing (IF) system provides a much closer minimum focusing distance (MFD) throughout its entire focusing range. It also improves optical performance by minimizing illumination loss at the corners of the image field, and helps to suppress other aberrations.
The Zoom Lock feature of the lens prevents unwanted barrel extension when carrying the lens/camera combination. So this gives you less thing to worry about when using the camera/lens on a neck strap.