This the new lens which I shall probably be buying in the near future -- the Tamron 150-600. Sal beat me to it, but kindly lent it to me to take a few images. It's a 6.3 lens, but the images here are all with it stopped down to f 7.1, and are all hand held. On a 70d or a 7d it gives the equivalent of over 900mm of reach, It's slightly soft at 600mm, but I took these at 550mm.The vibration control is superb - equivalent of 3-4 stops. Opinions welcome.