The new Canon Extender (converter) of the Series III to reiterate clearly in telephoto and super-telephoto optical performance and AF speed from Canon is inviolable. The Nikon and Sony-photographers like me do not be evil 'but in comparison seems to me the obvious. Also very few Sony lenses and some Nikon lenses can be used with the original converters. Only the Olympus Converter I find equally good as they can be used with almost any lens and the AF speed virtually not reduce. When converter lenses mean more = better correction = better image quality ', this equation has always been true in the converters. From 3 to 5 Linser Linser Canon has now increased significantly on the seven-Linser and the 2.0x Extender now come even 9 lenses used. Thus, the disadvantages of the converters are virtually no longer exists when the basic objective is good. The problem is still particularly with Canon and Nikon 'that the converter can be combined with only a few lenses. Converters are primarily intended to compose the image of telephoto lenses to improve with a fixed focal length. Very few zoom lenses with Aperture f 2.8 and f: 4.0 are used meaningfully with converters. They should at least be dimmed by one step. Faint super zooms as 6.3 / 16-300 mm; 6.3 / 18-200 mm; 5.6 / 28-300 mm; 6.3 / 150-600 mm, you should not use with converter and faint telephoto zoom like: 5.6 / 70-300 mm; 5.6 / 100-400 mm; 6.3 / 50-500 mm; 6.3 / 150-600 mm allow virtually no good image results expected. The pure tele zooms you could on f: Fade Out 8 and lift through targeted post contrast and sharpness to satisfactory image results from small animals or distant objects to obtain. You should always use a tripod and use ISO sensitivity of 1600 ISO and more. Kenko and Sigma have at least reasonably good and flexible (with almost all lenses) 1.4x converter.
At Canon, the 1.4x converter with autofocus works only on the following objectives: 2.0 / 135 mm L 3,5 / 180mm L Macro 2.0 / 200 mm L IS 300mm f / 2.8 L II 300mm f / 2.8 L IS 4,0 / 300mm L IS 2.8 / 400 mm L IS II 4.0 / 400 mm DO IS 5,6 / 400mm L 4.0 / 500 mm L IS II 4.0 / 600 mm L IS II 5.6 / 800 mm L IS (Canon EOS 1DX only; EOS 5D3; EOS 7D2 with AF, medium sensor) 70-200mm f / 2.8 L IS II 4.0 / 70-200mm L IS 4.0 / 70-200 mm L 5.6 / 100-400 mm L IS II (only Canon EOS 1DX; EOS 5D3; EOS 7D2 with AF, medium sensor) 4.0 / 200-400 mm L IS X1.4 Ext (And similarly designed variants older lens without IS and II)
The Canon Extender 2.0x works only with lenses of basic Aperture f: 2.8 with autofocus, or F: 4.0 at the latest cameras: Canon EOS 1DX; EOS 5D3; EOS 7D2 with AF, middle sensor - or he has to focus manually. However, manual work is in the super-telephoto range very difficult and time consuming and not necessarily recommended.
