I use the teleconverter with a Nikon D5200 and Sigma 50-200 mm F4.0-5.6 DC OS lens. Initial tests I conducted with tripod without stabilizer on a gloomy and second on a sunny day. I have photographed the focal lengths 50, 100 and 200 with and without the same object converter. I was able to determine, for example, between the result in focal length 200 without and 100 with converter no difference. This creates obvious in this area no quality loss, and the autofocus worked well with telephoto converter. Now I have the converter but another 200 in reserve and thus get to 400mm focal length, which has also provided quite useful results. When I zoom in the image without converter at 200mm focal length with a graphics program, then at least I have a poorer quality than found with the Kenko DGX 2X Tele Plus MC4 and the 200 focal length of the lens. However, the autofocus on the cloudy day has not in this area and on sunny work only partially. Interestingly, in Live View mode, but very comfortable. After that I made some freehand pictures with image stabilization and even these were also quite good at maximum focal length. I'm sure that for example with an AF Zoom Nikkor 80-400mm 1: will have a better result 4,5-5,6D ED VR lens, but that does not cost too rd. 1.200, - Thus this Kenko is to expand my telephoto for me, a relatively inexpensive way.
