There may soon be a new member of the Canon Extender EF lens family. A recently published patent filed by Canon describes a new 2.8x teleconverter. A 400 f/2.8L IS II would become a 1120mm f/8 lens with the teleconverter attached, though Canon will have to restore f/8 autofocus to its top-of-the-line cameras before that combo would become useful.
(via Egami via Canon Rumors)
Canon might be rolling out a new Image Stabilized lens with a built-in teleconverter, but Tamron and Nikon seem to have image-stabilization/vibration-reduction tricks up their sleeve as well. Apparently in the early 2000s both Nikon and Tamron filed patents for teleconverters with image stabilization baked right in. Tamron’s was for a standard unit that sits between the lens and the camera body, while Nikon’s was for a unit that sits in front of the lens.
Canon is on a tear today with its announcements. In addition to new Rebel cameras and new entry level flashes, they also have some lens news. First, they’re releasing new versions of their 500mm and 600mm lenses, but even more interesting is the EF 200-400mm f/4L IS USM Extender 1.4x lens they announced the development of. This is a zoom lens that has a 1.4x teleconverter built right in. Once you switch it on, it instant turns into a 280-560mm f/5.6 lens!