http://dpreview.com/news/1102/11020708canon200400mm.asp
Ein neues Objektiv von Canon mit eingebautem zuschaltbarem 1.4 Teleconverter
ZitatCP+ 2011: Canon has announced it is developing the EF 200-400mm f/4L IS USM Extender 1.4x lens, which features a built-in switchable 1.4x teleconverter. With the converter engaged, it becomes a 280-560mm F5.6 lens. Designed for sports and wildlife photographers the lens will feature weatherproof construction and is scheduled for launch later this year.
Quelle: dpreview.com