I use the teleconverter with the Sigma 150 to 500mm telephoto zoom on a D90 and I'm with the test results of the first photos very satisfied with the quality and it meets my expectations. Those who opt for such a combination and application, be the need to realize that you have devices in use that are not of the highest quality and professional quality and can not be expected that one creates perfect images therefore. That was clear to me when buying and for that I am very satisfied. A tripod is mandatory, the assembly must be easy manual focusing, for me only once a change, but I tend more and more to manual operation, hence it fits. The Exif data are all correct, you do not recognize that a Telkonverter is interposed.