The Canon TL-55 is a 1.4X front-end afocal teleconverter I use in my FZ10/20. Since I don't want to commit yet to additional lenses, tried to extend the 300mm (actually 480mm equivalent with the 1.6X crop factor of the XT) reach to 420mm. Still need to crop but a bit better than the 300mm alone. Most images cropped. All with level adjustment and a bit of sharpening.