I bought and returned the 1.4x because I saw no advantage to it. Using the 1.4x gave me more pixels on a small bird in the middle of the picture, for example, but reduced the quality so much that when I compared such a picture to one without the teleconverters, I saw the same amount of detail. And of course I lost one stop, and some flexibility on the wide side. What has been your experiences? Can someone run a test and upload 2 samples?