Based on the competitive price - - At the Canon 6d together with the 70-200 mm / F4 L IS the results are OK what does not work: When an object via AF at maximum telephoto (200mm) in focus and the focus is locked, then - at halbgedrücktem trigger - the focal length is changed to 70 mm, the property is no longer sharp. The focal plane changes with the focal length. Solution: to focus and do not change the focal length. This is somewhat impractical, but the converter is only a makeshift, to extend the focal length of 300 mm. Then the quality is decent. Also, the AF and tune the exposure, the aperture (5.6 instead of 4) is properly entered in the EXIF data. The in-camera Lens Correction function should be switched off, because the camera thinks he has the L-lens without converter off. The "verschlimmbesserte" result is worse than without the Lens Correction function.
