"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