I hope Tamron updates their 70-200 2.8 soon. I want to get a lens in this focal length soon and if Tamron at least announces soon I will wait. But as it is, I am missing photos, with not end in sight. May have to just drop big cash on the canon lens. I have the 17-50 vc. Optics are good enough for me, but I have tried canon L USM lenses and they are absolutely spectacular and blow this old generation focus mechanism away.