I had ordered me due to the good reviews here and read in forums that objective. Starting point was my Canon 50D and my 70-300 IS USM, which is a little too short. Since I was not a 100-400 come across before delivery, I was impressed by the part already when unpacking. The disillusionment came after the first test photos, some with and without a tripod, simply in the garden. In the first 20 photos a single really sharp. So it all over again with and without stability, with and without a tripod ... again the same. Then the 70-300 strikes .... better than the 100-400. Due to the images shown in the forums, and the many good reviews here, I think that the total cucumber has come under me. When we read in the notes in the individual reviews then that after adjustment then OK and the super optics, one imagines the question whether there still the quality is checked before delivery. With me no willingness such an expensive part after purchase once to send and to bring up to scratch. So that part went back and my frustration was great after such a disappointment. I do not know what should I do now. After crediting even a try or give up. Ohhhh Mannnn.
