"I would strongly recommend the zoom telephoto AF70-300 mm Macro Autofocus Lens. I used it on the deer and wild turkeys in my backyard. It was easy for a person with arthritis to use. Loved the autofocus." bhphotovideo.com
"I think The Sigma 70-300mm 4-5.6 DG Macro lens is the most compact and economical choice for a telephoto zoom lens. It has Consistent Output, Durable, Easily Interchangeable, Quick and Sharp Focus, its Construction is Rugged and Strong" bhphotovideo.com
"he Best Tamron lens up to date. Sharp on all focals from 70 to 300. Stabilization works (holds minimum 3 stops) good colors and bokeh. Very fast af focus." bhphotovideo.com