Add Yahoo as a preferred source to see more of our stories on Google. Canon RF teleconverters Rumors are abound that Canon is going to launch a zoomable teleconverter – and this looks like it might be ...

As a 1.4x teleconverter, the focal length of the attached lens is magnified by a factor of 1.4x, with a 1 f/stop reduction in aperture rating, so a 70-200mm f/2.8 zoom effectively becomes roughly a ...